You guys are awesome!
OA is D indeed.
Sometimes it hurts to be logical. Consider the following:
1. For X to be "natural" it should not contain A, B and C.
=> If X has even one of A, B, C its not "natural"
2. For X to be "natural" it should not contain A, B or C.
=> If X does not have one of A, B, C its "natural". So, if X has A and B but not C, it still qualifies.
So in terms of pure logic, #1 is the correct expression.
Thats the reason I preferred E to D.
Anyone who has never made a mistake has never tried anything new. -Albert Einstein.