The following diagram is a combination of four figures, A, B, C and D. Figure A represents the number of people who drink green tea. Figure B represents the number of people who drink cappuccino. Figure C represents the number of people who drink milk tea. Figure D represents the number of people who drink latte.

How many people drink latte or cappuccino but not milk tea?

Figure A → Green Tea drinkers
Figure B → Cappuccino drinkers
Figure C → Milk Tea drinkers
Figure D → Latte drinkers

People who drink latte or cappuccino but not milk tea = 5 + 3 + 7 + 2 + 6 = 23

Thus, the Correct option is (a)