The expression 
is equivalent to:
A . 5/7
B . x + 5
C . (x + 5) / (x + 7)
D . C5 / (2x C 7)
E . (2x C 15) / (4x C 21)
Answer: C
Explanation:
Factor the numerator and denominator and cancel like factors:
(x 2 + 2x C 15) = (x + 5) × (x C 3)
(x 2 + 4x C 21) = (x + 7) × (x C 3)
Cancel the (x C 3) term from the numerator and the denominator. The fraction reduces to (x + 5) / (x + 7).
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