It’s been weeks and I already sent the answer to you. So... Can I have the 10 points? Technically, I helped you in answering this question.
A.) simple
this is because a simple sentence is a sentence consisting of only one clause, with a single subject and predicate.
i say B.
Decorous
in keeping with good taste and propriety; polite and restrained.
Its A are. Oysters are opened with a knife