Which description is not a characteristic of a compound sentence?
a) it is made of two simple sentences.
b) it has two sets of the subject and verb pairs.
c) it is one simple sentence that has a compound subject and a compound verb.
d) it may contain a comma and a conjunction or a semicolon.

C) It is one simple sentence that has a compound subject and a compound verb.

Explanation:

Although a compound sentence can contain a compound subject and a compound verb, it is not only one simple sentence.  

A compound sentence contains TWO simple sentences, not one.

hopefully my answer helps! ♡

edwards uses the phrase "o who can express what the state of a soul in such circumstances is! " in order to illustrate that this type of suffering is unimaginable. the word "express" denoted that the state of a suffering soul is required to be described by any person, but it would not happen because no one can imagine how this suffering is felt.  

-show what might happen if the reader disobeys edwards is not correct because this is described trhough the text, not by the phrase used.

-describe what endless suffering looks and feels like is not correct because this description might be the porpuse of the excerpt provided, not the porpuse of using the phrase during the writting.

-prove that few people have survived limitless suffering is not correct because it is implied that the soul of a person is already suffering and doesn't have any way to escape.