Three formal requirements for writing expository prose are:
omission of contractions
use of standard english
avoidance of sentence variety
intentional use of technical jargon
establishment of objective attitude towards subject

The correct answers are A. "Omission of contractions", B. "Use of standard English" and E. "Establishment of objective attitude towards subject".

Explanation:

Expository writing is a type of writing that mainly aims at explaining one topic or situation by providing the events, details and any other type of information that is required for the reader to understand the many issue or topic explained this includes newspapers and scientific articles.

Additionally, most expository texts are written in prose rather than in verse and are formal texts, because of this it is recommended these texts are objective, which means they are not based on personal experiences or beliefs but on facts; also, in terms of style these texts should avoid contractions and jargon as these are considered informal and part of speaking but not writing and should use standard English, in this way these are neutral and understood by a broad public. Therefore, the requirements for writing expository prose are the omission of contractions, use of standard English and establishment of objective attitude towards the subject they describe.

source text: from the sketch here given it will be seen, that our good grandmothers differed considerably in their ideas of a fine figure, from their scantily dressed descendants of the present day. a fine lady, in those times, waddled under more clothes even on a fair summer's day, than would have clad the whole bevy of a modern ball room. nor were they the less admired by the gentlemen in consequence thereof. on the contrary, the greatness of a lover's passion seemed to increase in proportion to the magnitude of its object—and a voluminous damsel, arrayed in a dozen of petticoats, was declared by a low-dutch sonnetteer of the province, to be radiant as a sunflower, and luxuriant as a full blown cabbage. certain it is, that in those days, the heart of a lover could not contain more than one lady at a time; whereas the heart of a modern gallant has often room enough to accommodate half a dozen - - the reason of which i conclude to be, either that the hearts of the gentlemen have grown larger, or the persons of the ladies smaller — this however is a question for physiologists to determine. add punctuation to the following excerpt. writing under the name of diedrich knickerbocker washington irving aimed his potent satire at as diverse topics as political rivals such as thomas jefferson to the very ideal of looking back on the past affectionately: a fine lady, in those times, waddled under more clothes even on a fair summer's day, than would have clad the whole bevy of a modern ball room. a voluminous damsel, arrayed in a dozen of petticoats, was declared by a low-dutch sonnetteer of the province, to be radiant as a sunflower, and luxuriant as a full blown cabbage. in those days, the heart of a lover could not contain more than one lady at a time; whereas the heart of a modern gallant has often room enough to accommodate half a dozen