Select the most appropriate option to fill in the blank.
Your tongue gives you information about the taste of food, but your sense of smell also plays an important role when you breathe air out ______ eating.

Correct option is B

The correct preposition to fill in the blank is (b) while.
Explanation:
The phrase refers to the simultaneous action of breathing out and eating. The correct connector to show actions happening at the same time is “while.”
Correct sentence:
Your tongue gives you information about the taste of food, but your sense of smell also plays an important role when you breathe air out while eating.
Grammatical Rule Used:
Conjunction of Time – “While” is used to indicate that two actions happen at the same time.
✦ Explanation in Hindi:
“While” का प्रयोग तब किया जाता है जब दो क्रियाएं एक साथ चल रही हों। जैसे – He was reading while she was cooking.
Meanings of all options:
· (a) In – incorrect for simultaneous action. ❌
· (b) While – during the time. ✅
· (c) From – indicates origin, incorrect here. ❌
· (d) With – indicates association, not suitable here. ❌