PART B: Which detail from the text best supports the answer to Part A? A. "For several decades psychologists have wrestled with that question, and in recent years many, if not most, have embraced the idea that we are born with a tendency to be happy, or sour" (Paragraph 2) B. "But some participants were able to maintain that elevated level of happiness by keeping the memory alive and appreciating what they already had." (Paragraph 16) C. "'And if you look at studies of various superficial circumstances, like income, where you live, how many cars you have, those are pretty small'" (Paragraph 23) D. "'So that left 40 percent that we conclude, although not everybody would agree with this conclusion, is the percent that is affected by what you do.'" (Paragraph 24)