The question doesn't state that the number of dimes and/or number of pennies are greater than 0. So how is it B?

Since the variables d and p refer to the number of dimes and pennies respectively, they must be positive whole numbers (it’s impossible to have −3 dimes, or 1/4 of a penny). Regardless of what numbers the variables represent, 1/10 of any positive number plus 1/100 of another positive number will always be less than the sum of the two whole numbers. Column B will always be greater