Final answer:
In set A = {0, 2, 4, 5}, subset C = {0, 2, 4} is a valid subset because its elements are contained in A, but D = {1, 5} is not a valid subset as it contains an element (1) not present in A.
Step-by-step explanation:
In the set A = {0, 2, 4, 5}, the subset C = {0, 2, 4} is indeed a valid subset because all elements of C are also elements of A. However, the subset D = {1, 5} is not a valid subset of A because while it includes 5 which is in A, it also contains 1 which is not an element of set A.
The term 'subset' means that all the elements of the subset should be contained within the larger set. Therefore, C is a subset of A, but D is not.