Single correct option
The rescue team [reached the spot within an hour] of receiving the alert.
- A. reached to the spot within an hour
- B. No improvement
- C. did reach at the spot within an hour
- D. had reached the spot in an hour
Show answer and solution
Answer: (B) No improvement
'Reach' is transitive and takes no preposition, and 'within an hour of receiving' is a natural time expression. The original is correct. 'Reached to' and 'reach at' add wrong prepositions, while the past perfect would not fit the simple sequence. Read each replacement into the sentence and choose the one that is grammatical, idiomatic and keeps the original meaning; choose 'No improvement' only when nothing is wrong.
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