Which of these is an example of an abiotic factor?
I. Crickets
II. Rainfall
Ill. Shark

A)

I only

B)

II only

C)

III only

D)

I and III only

E)

I, II and III

Abiotic factors are the non living factors, substances and conditions of the environment which influence the physiology, survival, function, behaviour and reproduction of organisms. The major abiotic factors are temperature, water, light and soil. 

Hence among all the options given in the question, rainfall is the abiotic factor while crickets and sharks are included under biotic factors as they are living factors.

So, the correct answer is 'II only'.