Let X = Y% of a
Or X/Y = a/100.
Consider first (1) alone.
It means X/Y = 3.
Or 3 = a/100.
Or a = 300.
So (1) alone is sufficient.
Next consider (2) alone.
It means 6Y = 4X - 2X = 2X.
Or 6Y = 2X.
X = 3Y. This is same as statement (1).
So (2) alone is also sufficient.

The correct answer is hence (D).

M is a positive integer, is M odd?
1) 2M^3 + 2M is divisible by 8
2) M+10 is divisible by 10
Consider first (1) alone.
It means 2M(M^2 + 1) is divisible by 8.
Or M(M^2 + 1) is divisible by 4.
Let M be even.
So let M = 2k, k being an integer.
Or M(M^2 + 1) = 2K(4k^2 + 1). This is divisible by 4 only if k is even.
So if M(M^2 + 1) is divisible by 8, it is possible that M is even.
This can be verified by taking M = 4.
Next let us check that if M is odd, will M(M^2 + 1) will be divisible by 4 or not.
If M is odd, we can write it as 2K + 1 where k is an integer.
So M(M^2 + 1) = (2k + 1)( 4k^2 + 4K + 1 +1) = (2k+1)(4K^2 + 4k + 2).
= 2(2k+1)(2k^2 + 2K + 1).
Now both (2k+1) and (2k^2 + 2k + 1) are odd.
So they are not divisible by 2.
Or 2(2k+1)(2k^2 + 2k + 1) is only divisible by 2 and not by 4.
Or for M(M^2 + 1) to be divisible by 4, M cannot be odd.
Or statement (1) alone is sufficient to answer the question.
Next consider (2) alone.
Since M + 10 is divisible by 10, M is divisible by 10.
So M has to be even.
Or M is not odd.
So (2) alone is also sufficient.

The correct answer is hence (D).