Select the most appropriate option to fill in the blank.
The project must be completed _____ the end of the week.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. by.
Context: The sentence is about a deadline for project completion. The meaning of the sentence is that the project should be finished not later than the end of the week. We need the correct preposition that fits this context.
Analysis of the given options
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On: Refers to a specific day or date (e.g., on Monday) – not suitable here.
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At: Refers to a specific point in time (e.g., at 5 p.m.) – incorrect for deadlines.
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By: Means "not later than a particular time" – correct for deadline usage.
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In: Means "within a duration" – but does not fit this fixed deadline context.
Correct word: By
Reason: The word "by" correctly conveys the idea of finishing the project before or not later than the end of the week.
Final Sentence: The project must be completed by the end of the week.
Hence, the chosen option is correct.