J and K which is placed on an odd numbered position. The box K is placed below the box J.So, here we have three POSSIBLE cases:Case - 1:Box positionBox10J9 8 7 6 5K4 3 2 1 Case - 2:Box positionBox10 9 8J7 6 5 4 3K2 1 Case - 3:Box positionBox10 9 8 7 6J5 4 3 2 1K 2) The box M is placed below the box K. Two boxes are placed between K and L which is placed just below Q box.Hence case 3 ruled out.Case - 1:Box positionBox10J9 8 7 6 5K4M/3Q2L1M/ Case 1.1:Box positionBox10J9Q8L7 6 5K4M/3M/2M/1M/ Case - 2:Box positionBox10 9 8J7Q6L5 4 3K2M/1M/ 3) Q box is placed on 7TH position.Hence case 1 and 1.1 are ruled out.Box positionBox10 9 8J7Q6L5 4 3K2M/1M/ 4) Box B is placed below the box M.5) The box I is placed on an even numbered position but above the box P.6) The box A is placed immediate above the box R.Then final arrangement is-Box positionBox10I9P8J7Q6L5A4R3K2M1B Four boxes are placed between L and B box.Hence, the correct answer is four.