This is a tough one. I think D.
From 1) X has the same number of factors as 7^5 has. We can determine the number of factors of 7^5. Hence SUFFICIENT.
From 2) X = a^2*b SUFFICIENT. because factors of x = a, a^2, b, a*b & (X and 1 too!) (sinace a &b are primes)
For eg 12 = 2^2*3 => Facrots = 2, 4, 3, 6, also 12 & 1.
I think the statement (1) is not sufficient because it just provides information about number of factors, but doesn't mention that they are PRIME factors! Hence statement is INSUFFICIENT.
So the answer I think is B!
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