Let a and b be relatively prime integers with a>b>0 and \dfrac{a^{3}-b^{3}}{(a-b)^{3}}=\dfrac{73}{3}. What is a-b ?

**Answer Choices**

A. 1

B. 2

C. 3

D. 4

E. 5

Let a and b be relatively prime integers with a>b>0 and \dfrac{a^{3}-b^{3}}{(a-b)^{3}}=\dfrac{73}{3}. What is a-b ?

**Answer Choices**

A. 1

B. 2

C. 3

D. 4

E. 5