If xa=1a−1x,xa=1a−1x, then the value of x - x2 is?

• A. -a
• B. 1a1a1a1a1a1a1a1a1a1a11aa1a
• C. a
• D. −1a−1a−1a−1a−1a−1a−1a−1a−1a1a11aa−1a