Question

Fill the appropriate article for blank [1].

• A. a
• B. the
• C. an
• D. no article

Answer 1

The correct option is A a

1. 'An/A' is used as an indefinite article for a thing or person when the reader doesn't know which one we are referring to out of many nouns. It states the random nature of the subject.
2. 'The' is used as a definite article for a thing or person when the reader knows which one we are exactly referring to. It states the specific nature of the subject.
   

Option A is correct as 'a' indicates any random king (singular in number) who hasn't been mentioned previously.

Option B is incorrect as 'the king' means a previously mentioned king but in the context of the sentence, the reader doesn't know of this king previously.

Option 'C' 'an king' is incorrect. 'An' is used with a word having a vowel sound.

Option D is incorrect as the blank requires an article in order to give meaning to the sentence. 'Once king' sounds illogical.

Thus option 'A' is the correct answer.