Each of P, Q, R, S, T, U and V has an exam on a different day of a week starting from Monday and ending on Sunday of the same week.
U has an exam on Thursday. Only one person has exam between P and U. T has an exam immediately after P. As many people have an exam before T as after S. Q has an exam immediately after V but not on Sunday.
How many people have an exam between R and V?

U has an exam on Thursday. Only one person has exam between P and U. Let us form two possible cases:

T has an exam immediately after P.

As many people have an exam before T as after S.

In case 1, 0 people have an exam after T, so 0 people will have an exam before S. Thus S will have an exam on Monday.

In case 2, 4 people have an exam after T, so 4 people will have an exam before S. Thus S will have an exam on Friday.

Now, Q has an exam immediately after V but not on Sunday. In case 2, there is only possibility to place V-Q i.e Saturday and Sunday. But Q doesn't have an exam on Sunday. Hence case 2 is invalid.

So in case 1, V-Q will have exams on Tuesday and Wednesday respectively and R will have an exam on Friday.

From the table we can conclude that 2 people have exams between V and R.

Thus option D is the correct choice.