Bunuel
What is the remainder when a positive integer w is divided by 2?
(1) w is a multiple of an odd integer.
(2) w is a multiple of 5.
If w is odd, remainder would be 1 and if w is even, remainder would be 0. All we need to know is whether w is odd or even.
(1) w is multiple of an odd integer, but is it an odd multiple of that integer or is it even multiple of that integer - thats not given so we cant say. Eg, take an odd integer say 5. Both 15 and 20 are multiples of 5 (thus both 15/20 classify as multiples of an odd integer) but one of them is odd and other is even. So we cant say. Insufficient.
(2) w is a multiple of 5, again we cant say whether its an odd multiple of 5 (like 15) or an even multiple of 5 (like 20). So Insufficient.
Even after combining the two statements, we cant figure out whether w is an odd multiple of 5 or an even multiple of 5 (as already explained). Data is thus insufficient.
Hence
E answer