For what achievement did James Chadwick receive the Nobel Prize in 1935...? Mcqs

For what achievement did James Chadwick receive the Nobel Prize in 1935...?

(A) Discovery of the proton

(B) Discovery of the neutron

(C) Development of the atomic bomb

(D) Discovery of radioactivity

Source: This question is taken from the PMS General Knowledge PPSC Past Paper 2024