Final answer:
The product of two negative numbers, -15 and -3, results in a positive number, which is 45. This corresponds to option c from the given choices.
Step-by-step explanation:
The product of -15 and -3 is found by multiplying the two numbers. The rule of multiplication states that the product of two negative numbers is a positive number. Following this rule, we calculate:
-15 x -3 = 45
Therefore, the correct answer is 45, which from the given options is listed as option c. The product of -15 and -3 is 4545 (Option c). When you multiply two negative numbers, the result is positive.