Correct option is A
Given:
Total students = 21.
After moving 4 places to the right, Monika is 12th from the left.
Monika’s initial position from the left
12−4=8
So, her original position from the left end was 8.
Monika’s position from the right
The formula to calculate a person’s position from the right end is:
Position from the right=Total Students−Position from the left+1
Position from the right=21−8+1=14
Correct answer is (a) Fourteenth