It’s helpful to draw a diagram to solve this question. Let’s try assigning R to locker 1.
We can’t assign J to locker 1, because R is there and R has to be alone. We can’t assigned J to locker 3, because F is there and two boys can’t share.
But there’s no reason J can’t be assigned to lockers 2, 4 or 5. No matter where we put J, we just have to put the other shared locker somewhere else, and we obey all the rules.
So if we put R in 1, we can put J in three lockers. We can be sure that this is the maximum, because J can never go with R or F, no matter where we place R.
C is CORRECT.
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