[Solved] The best source for determining historical costs is usually: A) The Internet B) Interviews with managers C) The company's accounting information system D) Financial statements Sexual Activity: Behaviors involving the genitals aimed at deriving erotic pleasure, including intercourse and masturbation, among others. Perceived Level: An individual's subjective evaluation or estimation of something, such as their own skills or qualities. Hormonal Levels: Refers to the concentration of hormones in the bloodstream, which can influence physical functions, behaviors, and emotional states. Romantic Love: A deeply emotional and passionate form of love often characterized by attraction, commitment, and intimacy.