MHT CET Physics question

A disc of uniform thickness and radius 50 cm is made of two zones. The central zone of radius 20.0 cm is made of metal and has a mass of 4.00 kg. The outer zone is of wood and has a mass of 3.00 kg. The M.I. of the disc about a transverse axis through its centre is

• (A)0.510 kg-m
• (B)0.515 kg-mCorrect
• (C)0.500 kg-m
• (D)0.525 kg-m