You reciprocate when you return a favor, return a compliment, or respond "the same to you" to the angry guy in the car you just passed. In short, you react to an action, statement, or emotion by mirroring it. This one comes from the Latin verb reciprocare, meaning to move back and forth.
Before the noun, unless the adjective is predicate in which it comes after as long with the adjective having no ending at all.
The hyphen should be placed in C) fifty-two.
When you have compound numbers, meaning there are two words to denote a single number, starting from twenty-one, you need to use a hyphen.