Six playing cards are lying face down on a table, two of them are kings. Two cards are drawn at random. Let a denote the probability that at least one of the cards drawn is a king, and b denote the probability of not drawing a king. The ratio a/b is

A

$$\geq0.25$$and$$<0.5$$

B

$$\geq0.5$$and$$<0.75$$

C

$$\geq0.75$$and$$<1.0$$

D

$$\geq1.0$$and$$<1.25$$

E

$$\geq1.25$$