n efficient researcher is one who finishes his/her research work ______ time.Options at upto on by

The correct option to fill in the blank is "by."

Explanation:

1. Phrase Understanding: The phrase "finishes his/her research work ___ time" implies a deadline or a specific timeframe within which the research should be completed.
2. Option Analysis:
   • "at time" - This is not commonly used and does not fit well in this context.
   • "upto time" - This phrase is awkward and does not convey the intended meaning.
   • "on time" - While this is a possible phrase, it typically implies punctuality but lacks the emphasis on completion by a certain deadline.
   • "by time" - This indicates that the research should be completed before or at a specific deadline.

Thus, "by" is the most appropriate choice in this context.

Final Answer:

A researcher is one who finishes his/her research work by time.