A store sells four different kinds of shirts. If we want to buy two different kinds of shirts, how many possible combinations of two shirts can we buy?	Select the correct option:
A) 5
B) 6
C) 7
D) 8
E) 9
4C2=6.   The answer is 6.
<result>B</result>
A store sells four different kinds of shirts. If we want to buy two different kinds of shirts, how many possible combinations of two shirts can we buy?