What is Piaget's second stage of cognitive development?

Humanistic psychologists believe that:

a. humans are basically destructive and must constantly fight negative impulses. b. psychologists should study only objective events such as stimuli and behaviors. c. people are basically good and will generally strive to achieve positive social goals. d. none of the above

Heuristics are general rules

a. for solving syllogisms. b. for constructing mental models. c. for identifying appropriate exemplars. d. that are for a solution useful in guiding problem solving.