Match the following two columns.

Column I	Column II
(a) After emission of one $\alpha$ and one $\beta$ particles	(p) atomic number will decrease by 3
(b) After emission of two $\alpha$ and one $\beta$ particle	(q) atomic number will decrease by 2
(c) After emission of one $\alpha$ and two $\beta$ particles	(r) mass number will decrease by 8
(d) After emission of two $\alpha$ and two $\beta$particles.	(s) mass number will decrease by 4

• A

  (a) $\to$s, (b) $\to$p,r (c) $\to$s, (d) $\to$p,r

• B

  (a) $\to$s, (b) $\to$p,s (c) $\to$s, (d) $\to$q,r

• C

  (a) $\to$s, (b) $\to$p,r (c) $\to$s, (d) $\to$q,r

• D

  (a) $\to$p, (b) $\to$p,r (c) $\to$s, (d) $\to$q,r