Three uniform spheres are located at the corners of an equilateral triangle. Each side of the triangle has a length of 1.6 meters. Two of the spheres have a mass of 6.4 kg. The third sphere is released from rest. Assuming the only force acting on it is gravity, what is its acceleration?
A. 2.45 m/s²
B. 4.90 m/s²
C. 7.35 m/s²
D. 9.80 m/s²