Which of the following statements about normal profit are correct?

i. It is the reward for risk taking

ii. It is the return to entrepreneurship

iii. It is the cost of entrepreneurship

iv. It is earned only in the short run

A. (i) and (ii) only

B. (ii) and (iii) only

C. (i), (ii) and (iii)

D. (i), (ii) and (iv)