Final answer:
The original number is 240.
Therefore, the correct answer is d) 240.
Step-by-step explanation:
To find the original number, we need to reverse the 75% reduction.
We know that after reducing the number by 75%, the result is 60.
To reverse this reduction, we need to divide 60 by 0.25 (100% - 75% = 25%).
So, the original number is
60 / 0.25
= 240.