[Solved] Lisa's incorrect responses to the checkers problem indicate that she is still in the ________ stage of cognitive development. A) formal operational B) preoperational C) concrete operational D) sensorimotor Kin Selection: The idea that natural selection led to greater tendencies to help close kin than to help those with whom we have little genetic relationship. Mating Strategies: Approaches to mating that help people reproduce successfully. People prefer different matingstrategies depending on whether they are thinking about a short-term pairing or a long-termcommitment Playboy Centerfolds: Features in Playboy magazine showcasing nude or semi-nude photographs of women, often considered iconic in the history of adult entertainment. Physical Attractiveness: The degree to which a person’s physical traits are considered aesthetically pleasing or beautiful by others.