No one ever answers my questions
explain how to show reciprocal actions in spanish, and provide at least one example.

It seems that reciprocal actions are shown by adding the ending "a r s e" to the ending of a verb. The reciprocal actions are usually used when you are describing an action that two people are doing together. an example being Juan y María se casaron, carason being the reciprocal 

Right answer: a. comprarías

this question is given using the conditional form. conditional tenses are is used when talking about hypothetical situations and probabilities. also, this is used when making polite requests. so comprarías is the conjugation of the verb comprar that matches the second person singular in the conditional. finally:

¿cuál comprarías tú?

Any shoe store you go to