The correct option is D All of the above
Composite numbers are those numbers that have more than two factors.
The factors of 12 are: 1, 2, 3, 4, 6, and 12.
The factors of 10 are: 1, 2, 5, and 10.
The factors of 55 are: 1, 5, 11, and 55.
Thus, 12, 10, and 55 are composite numbers.