Suppose We Are Trying to Put Declarative English Sentences into Standard

Suppose we are trying to put declarative English sentences into standard form as categorical propositions.Will all of the English sentences have explicit subjects?

A) No, since many sentences have no subject at all.
B) No, since for some of these sentences, the subject could be an understood "you."
C) Yes, since English grammar requires an explicit subject in declarative sentences.
D) Yes, since English grammar requires an explicit subject in all sentences.
E) Yes, since without explicit subjects, the sentences would necessarily be interrogative rather than declarative.