Select the most appropriate option to fill in the blank.
Are you travelling to Kolkata ______ train?

Correct option is A

The correct option to fill in the blank is (a) by.
Explanation: The preposition "by" is used to indicate the means or mode of travel. When referring to general modes of transportation like "train," "bus," or "car," "by" is used without an article.
Grammatical Rule Used: Prepositions indicating travel modes are often idiomatic. "By" is the correct choice when no article or possessive is involved before the mode of transportation.
Rule in Hindi: यात्रा के माध्यम को व्यक्त करने के लिए "by" का उपयोग किया जाता है।
Example: Are you travelling to Delhi by car?
Meanings of other options:
· In: (Hindi: में) Used for being inside a place, not applicable here.
· From: (Hindi: से) Indicates origin, irrelevant here.
· On: (Hindi: पर) Indicates position or surface, does not fit the context.