Correct option is A
The correct preposition for the given sentence is
at.
The preposition
"at" is used when referring to specific prices, rates, or levels. Since the sentence refers to a specific discounted price,
"at" is the appropriate choice.
Grammatical rule involved:
In English,
"at" is commonly used when discussing costs or prices, e.g., "The book is sold
at $10."
Meanings of the other given options:
·
Over: ऊपर – Suggests something is physically above, e.g., "The lamp hangs
over the table." (Incorrect here as it doesn't relate to price.)
·
In: में – Refers to location or time period, e.g., "He lives
in Delhi." (Not suitable for referring to price.)
·
On: पर – Used for surfaces or specific days, e.g., "The book is
on the table." (Incorrect for price references.)