Change the direct narration into indirect narration:
Chandani said, "My Maths may improve very quickly."
The two ways of relating what a person has said are 1)direct and 2)indirect (reported speech).In direct speech, the original speaker's exact words are repeated. In indirect/reported speech, the exact meaning is expressed but not necessarily using the original speaker's exact words. Pronouns and possessive adjectives usually change from first or second person to the third person except when the speaker is reporting his own words. Sometimes a noun can be inserted to avoid doubt.
When we turn direct questions and exclamations into indirect speech, they are converted to affirmative statement .( ? and ! is not used).
Option D is correct as may is changed to might and my to her.
The other options are wrong as was going, had been able, and improved can't be used.
The correct answer is D)Chandani said that her Maths might improve very quickly.