Seven boxes D, E, F, G, I, J and K are kept one over the other but not necessarily in the same order. Only three boxes are kept above G. Only one box is kept between J and G. Only three boxes are kept between J and K. K is kept at some place above G. E is kept immediately below K. F is kept at one of the places above D. I is not kept immediately above or below J. Which box is kept at the lowermost position?​

Given: 

Seven boxes D, E, F, G, I, J and K are kept one over the other but not necessarily in the same order.

Only three boxes are kept above G.

Only one box is kept between J and G. 

Only three boxes are kept between J and K.

K is kept at some place above G.

E is kept immediately below K.

F is kept at one of the places above D.

I is not kept immediately above or below J.

D box is kept at the lowermost position.

Thus, correct option is (b).