Need asap, much appreciated! given: a = {(2, 3), (5, 1), (-3, -2), (0, 3)} a is a subset of n x r r x n n x n r x r

The key is to notice how 0 is a coordinate in the point (0,3)
N = set of natural numbers = {1, 2, 3, 4, 5, ...}
Basically we're dealing with counting numbers. The value 0 is not included in the set of natural numbers. So any answer choices that have N in them must be eliminated. This crosses off choice A, B, and C

The only thing left is choice D. The set of real numbers R includes 0 so saying A is a subset of R x R is a true statement.

Choice D