Parts of the following sentence have been given as options. Select the option that contains an error.
She was waiting for a opportunity to start her own business.

Correct option is C

Option (c) contains an error.
The segment "for a opportunity" is incorrect because the article "a" should be replaced with "an" before a vowel sound. The correct phrase is "for an opportunity."
Grammatical rule used: The choice between "a" and "an" depends on the initial sound of the following word. Use "an" before words that begin with a vowel sound (a, e, i, o, u), and "a" before words that begin with a consonant sound.
Example:
Incorrect: She is waiting for a opportunity to start her own business.
Correct: She is waiting for an opportunity to start her own business.
In this case, "opportunity" starts with a vowel sound, so "an" is the correct article to use.