Final answer:
The opposite of 6 is -6, and its absolute value is 6, so the correct answer is C.
Step-by-step explanation:
The question is asking for both the opposite and the absolute value of the number 6. The opposite of a number involves changing its sign. Therefore, the opposite of 6 is -6. On the other hand, the absolute value of a number is the non-negative value of the number without regard to its sign, meaning it is always positive or zero. Consequently, the absolute value of both 6 and -6 is 6. Therefore, the correct answer is C) The opposite of 6 is -6. The absolute value of 6 is 6.