Fill in the blanks with the most appropriate option:-

I prefer tea _____coffee.

to

The correct option to fill in the blanks is to.

The sentence is about comparing tea and coffee. The preposition "to" is used to compare two things. It is the most appropriate preposition to use in this context, as it describes the fact that the speaker prefers tea over coffee.

The other options are not as appropriate:

• Than is also used to compare two things, but it is more informal and can be used to compare things that are not very different.
• With is used to indicate association or connection. It is not as appropriate as "to", as it does not convey the same sense of comparison.
• By is used to indicate means or agency. It is not as appropriate as "to", as it does not convey the same sense of preference.