What type of clause is shown in parentheses? carla had left a message on the answering machine about (whomever you had spoken to)?

We are given the sentence above and is asked for the type of clause. The clause whomever you had spoken to is dependent since the sentence (original) cannot complete a thought without the clause in this parenthesis. If the sentence otherwise could stand on its own without the clause, then the clause could have been independent. 

Abiography is a description of a real person's life, including factual details as well as stories from the person's life. biographies usually include information about the subject's personality and motivations, and other kinds of intimate details excluded in a general overview or profile of a person's life.