Two things to keep in mind when you’re deciding whether to use formal or informal english are
a. the author and the audience
b. the reader and the location
c. the occasion and the audience
d. the opinion and the occasion

C. The occasion and the audience

Explanation:

Two things to keep in mind when you’re deciding whether to use formal or informal English are the occasion and the audience.

antonyms of what word?

explanation:

but it is sometime nessary to hit key points or subjects   but is sometimes to much reveiw if there was a way to slim down the redone work it would improve for every body.