The expression 3p2 represents the number of ways of:

a. choosing 2 items at a time from a set of 3.

c. arranging, in order, 2

The expression 3p2 is also read as "permutation of 3 taken 2". This represents the ways of choosing 2 items at a time from a set of 3. This means that the order of choosing between the three items is important. Thus, the answer is letter A.