If we are solving an enthymeme and the conclusion is an A proposition, then the premises:

A) can be any propositions
B) must be an A proposition and an I proposition
C) must both be A propositions
D) must both be I propositions
E) must both be E propositions

A Proposition

A declarative statement that can either be true or false, often used in logic and philosophy to express ideas or assertions.

Enthymeme

A rhetorical argument where one of the premises is not explicitly stated, usually considered to be evident to the audience.