Fill in the blank with most appropriate word.
The air ______ has gone up significantly.

Correct option is D

The correct option to fill in the blank is (d) fare.
Fare refers to the price paid for a journey on public transport. (यात्रा किराया)
Example: The bus fare has doubled in the past year.
Other options:
· (a) Rent: Payment for the use of property (किराया)
· (b) Charge: General fee for services (शुल्क)
· (c) Cost: Overall price of an item or service (लागत)