An idiom’s. a.
meaning can be determined from the usual meanings of its parts.
c.
meaning is a literal translation of a phrase.
b.
meaning is not predictable from the usual meanings of its parts.
d.
none of these

Explanation:

Idiom means

a group of words established by usage as having a meaning not deducible from those of the individual words 

B

Explanation:

A is wrong, since the meaning of idiom is: “Idiom definition, an expression whose meaning is not predictable from the usual. An idiom is a term whose meaning cannot be determined from the literal meanings of the words.”

C is wrong for the same reasons too, example if it was a literal meaning, the idiom “under the weather” would literally mean in the rain. However the actual meaning is “feeling down or upset.”

lastly D is wrong since B is correct, hence it can’t be “none or above.”

B is correct because it matches the definition.

have a lovely day!

answer; construals;

answer; reference group;