Answer:
-10 (C)
Step-by-step explanation:
Remember that a rational number is a number that can be expressed as a ratio or a fraction in the form of p/q where q ≠ 0.
Observe that options A, B, and D cannot be expressed in the form of p/q but -10 can be expressed as a fraction which is -10/1.
Thus, the correct answer is option C.
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