• The idiom "Man of straw" (or a "straw man") refers to someone who has no substance, no integrity, or no real power. Just as a scarecrow made of straw looks like a man but is hollow and weak inside, a "man of straw" is someone who cannot be trusted to stand up for their principles or lacks the financial means/character to be taken seriously.
Why it's C: It describes a person who is weak, lacks a strong character, or is easily controlled by others.
A, B, and D: These are completely unrelated definitions that do not match any historical or common usage of the phrase.
