Hello can you me posted picture of question

Disjoint events are those which do not have any outcome in common. From the given options only option D represents such an event.

Spinning a number less than 4 will result in 1,2 or 3 as outcome. Second event is getting a 6. So these two events do not have anything in common.

Thus, the answer is option D

I believe it is D because the definition of disjoint is separated or opposite position so if you visualize a spinner 6 and a number less than 4 would be on opposite sides