In a report or public document, a is often used to make a complicated process easier to understand.

a. diagram

b. schedule

c. footnote

d. pie chart

The correct answer is A. Diagram

Explanation:

Diagrams are visual aids useful to represent information including concepts, processes, relation between ideas and sequences in a visual way by selecting only key information and organizing it by using colors, lines, arrows and other visual tools that help the reader understand the way ideas are connected and related to the rest of the content in a text. This means, in most cases diagrams simplify and make easier the process of understanding some information. Additionally, there are multiple types of diagrams to represent almost any type of information which make them suitable to be used in any type of document including reports, analysis and other. Considering the previous ideas, in a report or public document a diagram is often used to help make a complicated process easier to understand as this type of visual aid is useful to represent any type of information in a concise way that makes the reader understand ideas better and easier.

given the fact that the question is about the detail that best support the idea that oppressive leaders use   propaganda to achieve thir goals,   the first option does not refer to any kind of propaganda, since it only tells about that the milk and the windfall apple should be reserved for the pigs. in the second option, that is, "snowball and napoleon sent out flights of pigeons whose instructions were to mingle with the animals on the neighbouring farms, tell them the story of the rebellion, and teach them the tune of "beasts of england". it can be identified that the oppressors make use of the propaganda, which is represented by the pigeons, and the information they have to tell other animals about what was happening in the farm in order to get their objectives. for that reason, the right answer is the second option, taking into account that the third option do not refer to propaganda since it only talks about that they did not want jones back. and, finally, the last option refers to the result of the given news, but it does not mean about the propaganda they used to achieve their goals.

i am also pretty sure it is c