Select the most appropriate option to fill in the blank
The farmer was going to sell his donkey _______ the town _______ a lot of money.

Correct option is C

The correct option to fill in the blank is (c) in; for.

• The preposition "in" is used to indicate the location (in the town).
• The preposition "for" is used to indicate the purpose or exchange (for a lot of money).
  Thus, the correct sentence is: The farmer was going to sell his donkey in the town for a lot of money.

Grammatical rule used:

• Prepositions like "in" indicate location, while "for" specifies purpose, exchange, or reason.

Meanings of other options:

• in; with: Incorrect as "with" does not imply exchange.
• at; to: Incorrect as "to" does not fit the intended meaning.
• at; by: Incorrect as "by" does not imply exchange of money.

Example:

• Correct usage: She bought the painting in the market for a reasonable price.