The product of two integers is -18; the integers are :

1. -2 and 9 or -9 and 2

2. -6 and -3 or 6 and 3

3. -9 and -2 or 9 and 2

4. 1 and 18 or 18 and 1.

In 1st option :

-2 × 9 = 18 and -9 × 2 = -18.

Hence, Option 1 is the correct option.