Select the option that is related to the third term in the same way as the second term is related to the first term.

Water : Pump :: Blood : ?

Given:  Water : Pump :: Blood : ?

Water → Pump:
Water is moved by a Pump. The pump circulates or moves water from one place to another.
Similarly, Blood is circulated by the Heart. The heart pumps blood throughout the body.

​Blood → Heart​
Thus, the correct option  is (a) Heart.​​