When conducting research, writers should use research questions to focus and guide the research.
O check for proper spelling and grammar.
O organize all of the research sources used.
find and discard unreliable research sources.

because

Explanation:

These are all important material uses for persuading readers in english

i believe the answer is: b. mr. head had a long, tube-like face with a rounded open jaw and a short depressed nose.

this is because in the un-revised sentence it said that mr. heads face was long and tube-like, and he had a rounded open jaw. this is not a very grammatically correct because of how it seems to drag on with the and, replaced with, with, makes it sound more fluent in the description.

c. when the head chef asks the applicants to make any creative dish they like (i did the usatestprep)