What is the sign of the product (8)(−23)( −21)(−29)?

a) positive, because the products (8)(−23) and (−21)(−29) are negative, and the product of two negative numbers is positive

b)positive, because the products (8)(−23) and (−21)(−29) are positive, and the product of two positive numbers is positive

c)negative, because the product (8)(−23) is positive and the product (−21)(−29) is negative, and the product of a positive number and a negative number is negative

d) negative, because the product (8)(−23) is negative and the product (−21)( −29) is positive, and the product of a negative number and a positive number is a negative number