Choose the correct alternative which will improve the part of the sentence given in quotes.
Sumathi was 'a industrious' and willing worker.

Correct option is A

The correct option is (a) An industrious.
Error identification: The article "a" is incorrect before a word that begins with a vowel sound. "Industrious" starts with a vowel sound, so the correct article is "an."
Grammatical Rule used: The article "an" is used before words that start with a vowel sound.
Corrected sentence: Sumathi was an industrious and willing worker.