The correct answer is support.
The correct answer is (A) To support; to prop up; to reinforce or uphold *theory, quality, belief, etc.); to add to. .
Bolster comes from Middle English bolstre, Old English bolster (cushion), Icelandic bolstr, Danish bolster, German polster.
Examples of use:
- He bolstered his argument with new information.
- She reads biographies of successful women to bolster her determination.