Which reference would someone check to see if the above sentences uses the conventions of standard english?

dictionary

thesaurus

usage dictionary

grammar guide

Hi, I'm afraid you didn't put any of the sentences you are referring to, but I think I can respond anyways because the reference that would help someone check to see if a sentence uses the conventions of standard English is the dictionary. The correct option is the first one.

Explanation:

The dictionary is the only one of the options that will help you with the definition of the words as  ther are used in the standard English. The usage dictionary would apply if you were looking for the meaning of the words based in usage and not on the rules established as correctness. A grammar guide would help just with grammar and not with the meaning of the words, and a thesaurus would just give a list of synonyms and related concepts that will not help if what you are trying to do is check the correct meaning.

tending to cause harm

c. to understand which information will best persuade your readers. (apex) correct answer.