Fill in blanks with the most suitable articles:

I saw ________ one-rupee coin lying on _______ ground.

In the given question, we've to search out the acceptable articles to place within the blank before ‘one-rupee coin’ which may be a common singular noun, and ‘ground’, which is another singular noun.
Thus, since one coin was lying which ‘I’ saw, 'a' shall be utilized in the primary blank. 'An' won't be because ‘one’ starts with a consonant and not a sound.
'The' are employed in the second blank since the speaker is concerning a specific place ‘I’ saw the coin on.
Let us analyze the choices given to us during this question:
Option (a.), 'a, the', is correct because it includes the article ‘a’ for the primary blank and therefore the article ‘the’ for the second blank.
Option (b.), ‘a, no article', is inaccurate as we'd like an explicit article for the second blank since ‘ground’ may be a particular place.
Option (c.), ‘the, the', is inaccurate as we want an article ‘a’ for the primary blank.
Option (d.), ‘no article required, no article required’, is wrong as we'd like the article ‘a’ for the primary blank and also the article ‘the’ for the second blank.