Select the most appropriate option to fill in the blank.
They arrived ___________ the airport on time.

Correct option is B

The correct option to fill in the blank is (b) at.
Explanation: We use “at” for a specific point/place (stations, stops, buildings used as points): at the airport, at the station, at the bus stop (Hindi: पर). Hence, “They arrived at the airport…” is idiomatic and correct.
Example: “We reached at the station by 6 a.m.” / Better: “We arrived at the station by 6 a.m.”
Explain why other options are incorrect:
· (a) over: Generally indicates movement above/covering; not used with arrive. (Hindi: ऊपर/पर से).
· (c) in: Used for cities/countries/large areas (e.g., arrive in Delhi), not specific points like airports. (Hindi: में).
· (d) on: Used with days/dates/surfaces/transport (e.g., on Monday, on the table); not for arrival at a point. (Hindi: पर/ऊपर).