Hey can someone help me with this question I don't know what to do!

Mary subtracts two integers.

Which condition will always give Mary a positive solution when she subtracts two integers?

a. Both integers have negative values.
b. Both integers have positive values.
c. The first integer has a positive value, and the second integer has a negative value.
d. The first integer has a negative value, and the second integer has a positive value.