General Studies · Floor and Box Puzzle

Seven boxes A, B, C, D, E, F, and G are kept one above the other, but not necessarily in the same order. Only three boxes are kept above E. Only one box is kept between B and E. Only three boxes are kept between B and D. D is kept at some position above E. G is kept immediately below D. C is kept at some position above F. A is not kept immediately above or below B. How many boxes are kept below C?