Choose the One Alternative That Best Completes the Statement or Answers

Multiple Choice

Choose the one alternative that best completes the statement or answers the question.
Simplify the complex fraction
- $\frac{\frac{1}{a}+1}{\frac{1}{a}-1}$

A) $\frac{1+a}{1-a}$

B) $\frac{a}{1-a^{2}}$

C) $1-\mathrm{a}^{2}$

D) 1