If the sum of two integers is 6, then it must be true that

Candyfloss1, DQ7777777, jojo95

I want to clear the confusion that a lot of the folks have around options D and E. The question is a must be true question, hence we need to read D and E accordingly.

(E) if one integer is positive, the other is negative
Read this as - if one is positive then should the other one \(MUST\) be negative?

Let's say the first integer is 1 (positive). Now ask the question, should the other one MUST be negative? No, because the other integer can be 5 (positive) and the sum can still be 6
Hence, it is not mandatory for the second integer to negative if the first integer is positive.

(D) if one integer is negative, the other is positive
Read this as - if one is negative then should the other one \(MUST\) be positive?

Let's say the first integer is -1 (negative). Now ask the question, should the other one MUST be positive? Yes, because the other integer has to be 7 (positive) for the sum to be 6. Similarly, if the first integer is -2 (negative) then the second integer has to be 8 (positive). Try to fit a second negative integer after picking a first negative integer and get the sum as 6. You will not be able to find such a combination