The boat arrived ______ dawn.
A. in B. at C. on D. under
GATE 2019 · General Aptitude · Prepositions · medium
Answer: B. at
Classify 'dawn' as a specific time point: 'Dawn' refers to a specific moment (first light) rather than a long period. In English, specific time markers like dawn, dusk, noon, midnight, and sunrise always use 'at'.
Eliminate other options: 'In dawn' is ungrammatical. 'On dawn' is used for days, not time-of-day expressions. 'Under dawn' makes no sense in this context.