If the total amount spent by C is more than D but less than B, then what is the possible list of items that C could have had at the canteen?
Either (1) or (3)
The total amount spent by C is more than D (20) but less than B(23). Which means that the total amount spent by C can be either 21 i.e. P and R or 22 i.e. S and P. Hence, option (d) is the correct choice.