Which of the following is a grammatically acceptable sentence ?

Correct option is A

Solution Correct Answer: (a) Give me four five rupee notes.
Explanation:
In English, when a numeral + noun combination is used as a compound adjective before another noun, the first noun remains singular.
Here, “five rupee” describes the type of note (not the quantity of rupees individually).
So, “five rupee” works as a compound adjective modifying the noun “notes.”
Hence,
“four five rupee notes” = four notes, each of five rupees.
Information Booster:
→ When we use compound adjectives of measurement, amount, or value, the first word stays singular.
Examples:
→ a five-rupee coin
→ a ten-kilometre race
→ a two-hour journey
→ a five-star hotel
The plural form (like “rupees”) is not used in such compound expressions because the main noun (“notes,” “coins,” “journey,” etc.) already carries the number idea.
Additional Knowledge:
→If the expression comes after the noun, then the normal plural form is used:
→ “These notes are of five rupees each.”
→ “The race is ten kilometres long.”
But when it comes before the noun as an adjective, it remains singular:
→ “a five-rupee note”
→ “a ten-kilometre race”