If set M is a set of Whole numbers less than 15 and set N is a set of Composite numbers less than 15, what N - M?

A. {4, 6, 8, 9, 10, 12, 14}
B. {}
C. {0, 1, 2, ...,14}
D. {0, 1, 3, 5, 7, 11, 13}​