According to Carstensen's socioemotional selectivity theory, at younger ages the goals that people have for their social relationships are ________

In symbolic play, children:

A) engage in mindless repetitive motor activity. B) play alone with their toys and do not share them. C) engage in games with rules, such as board games. D) create settings, characters, and scripts.

________ are used in an experiment, along with your dependent variables, to test whether or not your independent variable had its intended effect.

A. Matching variables B. Manipulation checks C. Quasi-variables D. Pilot studies