Write down a pair of integers whose sum is -7.[a] -5,-2[b] 5,2[c] -6,-1[d] Both a and c.

To solve this problem, we need to find a pair of integers whose sum equals -7.

Let's check the options one by one:

[a] -5, -2: -5 + (-2) = -7. This satisfies the condition.

[b] 5, 2: 5 + 2 = 7. This does not satisfy the condition, as the sum is positive.

[c] -6, -1: -6 + (-1) = -7. This also satisfies the condition.

[d] Both a and c: Since both options [a] and [c] satisfy the condition, the correct answer is option [d].

Therefore, the correct answer is: [d] Both a and c.