Question

Seven boxes L, M, N, O, P, Q and R are kept one above another such that bottommost box is numbered as 1 while the topmost as 7. Box O is prime numbered box above box N, which is third box. There are two boxes between box O and box Q. Box L is three boxes above box R. Box P is just above box
M. Which of the following is the topmost box?

A O
B P
C L
D R
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