A piece of art suspended from a ceiling consists of a triangular sheet of mass M hung from a circular disk of radius r and mass m, with a lightweight cord connecting them. The cords attaching the disk to the ceiling are attached at points equally spaced around the circumference of the disk. If the tension in the cord isT, the total gravitational force on the disk and the triangular sheet is,
A) Mg
B) mg
C) (M+m)g
D) 2mg