Suppose a firm’s total cost function is given by TC = 6,000 + 2Q + 0.25Q2, where MC = 2 + 0.5Q. The output level that minimizes average total cost

Suppose a firm’s total cost function is given by TC = 6,000 + 2Q + 0.25Q2, where MC = 2 + 0.5Q. The output level that minimizes average total cost is ____.
A) 154.9
B) 175
C) 150
D) 0