Aperson who can imagine the experience of someone else's emotions has what ability?
a. discipline
b. empathy
c. optimism
d. motivation

B. Empathy.

Discipline means training someone to obey a certain law or rule.
Optimism is like being hopeful about something that might not necessarily be realistic.
Motivation is like the reason for doing something; a motive.

This leaves empathy. The definition of empathy by dictionary definition is 'the ability to understand the feelings of another' 

The last one i think