In the figure shown, what is m∠A? Explain.
A. 57; △ABC is an isosceles triangle with base angles A and C. m∠A = m∠C.
B. 66; △ABC is an isosceles triangle with base angles B and C. m∠B = m∠C = 57, and m∠A + m∠B + m∠C = 180.
C. 57; △ABC is an equilateral triangle.
D. There is not enough information to find m∠A