The rope is connected with the moving pulley through the crown block, and the tension of the rope is equal to the gravity of m2. The force analysis of m 1 connected pulley shows that Tsinα=Tsinβ in the horizontal direction, so α = β. Vertically, Tcosα+Tcosβ=m 1g, while T=m2g, there is 2mGCoα = M65538.

So choose ad.