Extrinsic motivation is defined as
a) the pursuit of an activity for external reward
b) the pursuit of an activity for its own sake
c) the pursuit of an activity to relieve the state of tension caused by deprivation
d) the pursuit of an activity in order to increase one's competence and skills

option a : the pursuit of an activity for external reward

Explanation:

Extrinsic motivation is type of motivation consist of external mode of encouragement which can be in the form of money appraisal, fame etc.

extrinsic motivation is totally different from intrinsic motivation which involve motivation from inside or internal motivation from an individual. while extrinsic are external motivation.

intimacy, passion and commitment are the components of a interpersonal relationship emphasized in the triangular theory of love by robert sternberg.

the triangular theory of love says love can be comprehend as this componest form the vertices of a triangle.  

intimacy relates to feelings such as of closeness and connection;

passion relates the drives that brings people together, as physical attraction.

commitment relates to the being in a long-term relationship.

its d i know cause i've been googling it