What is a motive?
a. a reason for doing something
b. the way you feel about doing something
c. a step in the decision making process
d. the way you interpret information

The answer is letter A.

Motives are reasons for doing something particularly hidden or not obvious. Often times, people are questioned by their motives when in different environments where competition is a great part of interactions. Motives have strongly built and destroyed empires through many generations in history. It had caused leaders their lands, people who sacrificed, and many sorts of abrupt changes.

In modern times motives are usually seen in movies when villains plot their work carefully in an attempt to destroy the other. 

Cotton with iron probably