Bananas are selling . . . . . . . . Rs. 250 per dozen? A. on B. over C. with D. at

The correct answer is D. at.

The preposition “at” is used to indicate a price. In this case, the price of bananas is Rs. 250 per dozen.

The other options are not correct because they do not indicate a price.

• The preposition “on” is used to indicate a location. For example, “The bananas are on the table.”
• The preposition “over” is used to indicate a distance or a period of time. For example, “The bananas are over there.” or “The bananas are overripe.”
• The preposition “with” is used to indicate possession or association. For example, “The bananas are with the other fruits.”

I hope this helps! Let me know if you have any other questions.