The most commonly used method for determining potential reinforcers is

Which of the following best describes Jennifer Tanner's principle of recentering?

a. The center of emotional life is transferred from the original family to a long-term romantic partner. b. The center of emotional frustration is transferred from its original source to a secondary nonrelated source. c. During infancy, the center of development is located within an individual's genotype, but as time passes, environment plays a larger role, therefore moving the center of development. d. The typical American emerging adult is likely move back into his or her parents' home at least once, thus recentering their everyday activities back to their childhood home and away from a dorm or shared apartment.

Increased sexual attraction and subtle changes in secondary sex characteristics occur at approximately what age?

A) 7 years B) 9 years C) 11 years D) 13 years