2 answers:
First eliminate both roots by squaring both monomials.
(√42x^5)² = 42x^5
(√6x³)² = 6x³
Then divide
42/6 = 7
x^5/x³ = x^(5 - 3) = x²
7x², or (D) is your answer
hope this helps
The answer is a. 
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