Some laws/processes are given in Column $I$. Match these with the physical phenomena given in Column $II$.

Column $I$	Column $II$
$(A)$ Transition between two atomic energy levels	$(p)$ Characteristic $X$-rays
$(B)$ Electron emission from a material	$(q)$ Photoelectric effect
$(C)$ Mosley's law	$(r)$ Hydrogen spectrum
$(D)$ Change of photon energy into kinetic energy of electrons	$(s)$ $\beta$-decay

• A
  $A \rightarrow (q) \& (s), B \rightarrow (q) \& (p), C \rightarrow (p), D \rightarrow (s)$
• B
  $A \rightarrow (p) \& (r), B \rightarrow (q) \& (s), C \rightarrow (p), D \rightarrow (q)$
• C
  $A \rightarrow (s) \& (r), B \rightarrow (p) \& (s), C \rightarrow (p), D \rightarrow (s)$
• D
  $A \rightarrow (p) \& (q), B \rightarrow (q) \& (r), C \rightarrow (p), D \rightarrow (q)$