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Hope you are fine.

Which choice is correct? Please explain your reasons and tell me why other options are wrong.

A) When was A telescope invented?

B) When was THE telescope invented?

C) When were telescopes invented?

Thank you


They are all technically correct in a grammatical sense, but assuming the questioner is referring to the first example of the class of instruments referred to by the term "telescope," B) is the correct question.

However, since there are several kinds (refracting, reflecting, radio, etc.) of telescope, A) could reasonably be asked and have multiple answers.

C) probably asks about the same question as B) but is a less conventional phrasing. Again, it could have multiple answers.

Hope this helps.

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