A child watched Sally put a ball in a red box in front of Anne. Sally then goes away and Anne moves the ball to a blue box. The child is then asked, "Where will Sally look for her ball?" A child who says that Sally will look in the blue box has not yet developed _________, that is the ability to understand another person's mental state and take on another person's perspective. When children have achieved this, they understand that sometimes people can have false beliefs about the world.
a. theory of mind
b. cognitive empathy
c. emotional intelligence
d. social understanding