or
or
Like her brother she is also heiress.
The correct answer is “an.”The sentence should be written as “Like her brother, she is also an heiress.”In this context, "an" is used before the word "heiress" because "heiress" begins with a vowel sound, specifically the sound /i:/ (pronounced as "ee"). When the noun following the indefinite article ("a" or "an") starts with a vowel sound, "an" is used instead of "a" to ensure smoother pronunciation.
