What is the sign of the product (3)(−25)(7)(−24)?

a positive, because the products (3)(−25) and (7)(−24) are negative, and the product of two negative numbers is positive
b positive, because the products (3)(−25) and (7)(−24) are positive, and the product of two positive numbers is positive
c negative, because the products (3)(−25) and (7)(−24) are negative, and the product of two negative numbers is negative
d negative, because the products (3)(−25) and (7)(−24) are positive, and the product of two positive numbers is negative