To solve the exercise shown above and find the correct answer, you must apply the proccedure shown below:
1. As you can see in the figure attached, you have:
(4^-3)^5
2. By the exponents properties, you have to multiply:
4^(-3)(5)
4^-15
3. The sign - indicates that the 4 is in the denominator. Therefore, you have:
(1/4)^15
4. As you can see, yhe correct answer is the option b:
b. (1/4)^15