Motivation can be defined as the cause that ______.

A) makes people achieve the impossible
B) enables people to achieve beyond their normal means
C) makes people do what they do
D) disables people from making mistakes

Motivation is the reason or cause that drives people to act or behave in a certain way. It is the spark that ignites action, and it can come from a variety of sources such as personal values, goals, social pressure, or external rewards. Therefore, option C, "makes people do what they do," is the most appropriate definition of motivation. Options A and B are incorrect because motivation does not necessarily lead to achieving the impossible or going beyond one's normal means. Option D is also incorrect because motivation does not disable people from making mistakes rather it encourages people to learn from mistakes and keep going.