If $$\left(a - b\right) = 1$$, then what is the value of $$\left(a^{3} - b^{3}\right)$$?

A

$$a^{2} +ab+b^{2}$$

B

$$\left(a + b\right)^{2} +3ab$$

C

$$a^{2} - ab + 1 + b^{2}$$

D

$$a^{2} + 2ab + b^{2}$$