How should this analogy be read ?

heart; body: : engine; car
a. heart is a part of a body, engine is a part of a car
b. heart is to body as engine is to car
c. heart and body, engine and car
d. heart and engine are parts, body and car are the whole

A. heart is a part of a body, engine is a part of a car

the central idea of the above passage is following;

central idea: cultural study is very important specially archaeology. grimm's stories very well cater to the importance of cultural relevance.

explanation:

onto a large boat, and mark the water level that the boat sinks to. then, take the elephant out and put a bunch of marked weights onto the boat until it reaches the same water level. add up the masses of the weights to get the weight of the elephant.