Your question was =
What will be the digit in the unit’s place of a single digit which belongs to the set of natural numbers, when this number is raised to the power 5?

Your Correct answer: a

Details description:
In order to answer this question,
let us find out the values of the different natural numbers in the ascending order of their powers upto the power 5.
For the natural number 2:
2, 4, 8, 16, 32
For the natural number 3:
3, 9, 27, 81, 243
For the natural number 4:
4, 16, 64, 256, 1024
For the natural number 5:
5, 25, 125, 625, 3125
From the above results we can come to a conclusion that the digit in the unit’s place
when any single digit natural number is raised to the power 5 is equal to the digit itself.

Hence, the correct answer is option a.