In a family 11 people eat only vegetarian, 6 people eat only non veg., 9 people eat both veg and non veg.. How many people eat veg in the family? Select the correct option:
A) 20
B) 11
C) 9
D) 31
E) 21

Rationale: "total people eat veg = only veg + both veg and non veg total = 11 + 9 = 20 answer = a"
Answer: A