Is J + K > L + M ?

This question is testing your understanding of number properties. At first glance it seems obvious that the answer would be D (both statements alone). But upon further thought, you would find that there is no restriction that the numbers have to be positive. Therefore, it is possible that any of the numbers could be negative. Knowing that, if we try to plug in some extreme examples we find that we cannot prove the statement and the correct answer is E. Here are some sample numbers I tried to plug in.

Statement 1:

J = 3
L = 2
M = 1
K = 100 or -100
Using one value of K gives me TRUE, using the second value gives me FALSE. Therefore Statement 1 is insufficient.

Statement 2:
Just like Statement 1, but switch J and K.

K = 3
L = 2
M = 1
J = 100 or -100
Using one value of J gives me TRUE, using the second value gives me FALSE. Therefore Statement 2 is insufficient.

But what makes E correct, and why not C?