Answer:
I think it’s A!
Explanation:
The other answers aren’t synonyms for parts.
Buoyancy describes the tendency of an object to sink or float. It is the uphill push on a fluid.
C Swallowed. If it is a capsule then it shouldn’t be chewed. Can’t be measured. Worked just doesn’t fit with the context.
The last sentence. The word vindicated is a strong word to use and conveys a lot of emotion.