The correct answer is D. no article.
The word “one” is a number, not a specific noun. Therefore, we do not need to use an article before it.
Here are some examples of how we use articles with numbers:
- I have one book.
- I have two cats.
- I have three apples.
In these examples, the numbers are specific. We know exactly which book, cats, and apples we are talking about.
However, in the sentence “I gave one rupee coin to him,” the number “one” is not specific. We do not know which rupee coin we are talking about. Therefore, we do not need to use an article.
Here are some other examples of how we use articles with non-specific nouns:
- I like music.
- I like to eat pizza.
- I like to go to the park.
In these examples, the nouns “music,” “pizza,” and “park” are not specific. We do not know which music, pizza, or park we are talking about. Therefore, we do not need to use an article.