Which of the Following BEST Summarizes the Research Conducted into the Causes

Which of the following BEST summarizes the research conducted into the causes of sexual orientation?

A) While many studies have been conducted, it is still unclear as to what determines sexual orientation.
B) The large majority of studies indicate that sexual orientation has an entirely biological basis.
C) The majority of studies support the theory that sexual orientation is learned.
D) The majority of studies support the theory that sexual orientation is a choice.