Terms, Predicates, and Quantifiers - Lecture 5 (Logic)

What is the key difference between a proposition and a predicate?

1. A.A proposition is true or false; a predicate becomes true or false only once given its terms
2. B.A predicate is true or false; a proposition needs additional terms
3. C.Propositions contain variables; predicates contain only constants
4. D.Predicates are sentences in English; propositions are sentences in logic