Fill in the blank with an appropriate Preposition:

I prefer buttermilk ____ lassi.

to

The correct answer is Option (2) → to

In English, when expressing a preference between two things, the preposition "to" is used with the verb "prefer". This is a standard grammatical structure:

• Correct usage: "I prefer buttermilk to lassi."
• Why not "over"? "Over" can imply physical position or choice in some contexts (e.g., "I choose this over that"), but with "prefer," "to" is the grammatically correct preposition.
• Why not "in" or "on"? These prepositions don't make sense in this context as they are not used for expressing preference or comparison.

Thus, "to" is the appropriate choice.