A
B
C
D
Explanation
Correct answer: C.
Choice C is correct. In the given expression, and are like terms. Combining these like terms yields . It follows that the expression is equivalent to .
Why the other choices are wrong
Choice A
Choice A is incorrect and may result from conceptual or calculation errors.
Choice B
Choice B is incorrect and may result from conceptual or calculation errors.
Choice D
Choice D is incorrect and may result from conceptual or calculation errors.