JEE Main Physics question

A block of mass M, placed on a frictionless horizontal table, is pulled by another block of mass m hanging vertically by a massless string passing over a frictionless pulley. The tension in the string is

• (A)mg/(M+m)
• (B)Mg/(M+m)
• (C)[(M+m)/Mm]g
• (D)[Mm/(M+m)]gCorrect