Your spouse withdraws attention from you each time you begin criticizing her cooking. Eventually, you stop criticizing your spouse's cooking. The withdrawal of attention can be categorized as

Brian is the bassist and vocalist for a band with his two

brothers, cousin, and a college friend. Recently, he has begun to experience more and more intense anxiety as he sings in front of crowds. As a result, he has begun to ask his bandmates to sing the songs for him. Brian's anxiety lessens when the focus of the crowd is not on him, demonstrating that Brian's avoidance of singing is being A) negatively punished. B) negatively reinforced. C) positively punished. D) positively reinforced.

Most multiple births are

a. identical twins. b. fraternal twins. c. triplets. d. monozygotic twins.