Final answer:
The set P = {0, 1, 2, 3} has 16 subsets.
Step-by-step explanation:
The set P = {0, 1, 2, 3} has 4 elements. A subset of a set is a collection of elements that are chosen from the original set. To find the number of subsets of set P, we use the concept of power set. The power set of a set is the set of all possible subsets of that set.
For a set with n elements, the power set has 2^n subsets. Therefore, the power set of set P will have 2^4 = 16 subsets.
So, the correct answer is D. 16.