Let A_{0}=(0,0). Distinct points A_{1}, A_{2}, \ldots lie on the x-axis, and distinct points B_{1}, B_{2}, \ldots lie on the graph of y=\sqrt{x}. For every positive integer n, A_{n-1} B_{n} A_{n} is an equilateral triangle. What is the least n for which the length A_{0} A_{n} \geq 100 ?
Answer Choices
A. 13
B. 15
C. 17
D. 19
E. 21