In the following reaction, the values of a, b and c, respectively are 

$$a\,\text{F}_2(g) + b\,\text{OH}^-(aq) \to c\,\text{F}^-(aq) + d\,\text{OF}_2(g) + e\,\text{H}_2\text{O}(l)$$

A

3, 2, 4

B

3, 4, 2

C

2, 2, 4

D

2, 2, 2