Transform the following sentence from direct to reported speech.
He asked, "Did she meet her yesterday?"
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 C is correct as when we convert the given direct question to indirect speech which doesn't start with a question word, then if/whether is used, the simple past tense is changed to past perfect tense (had met) and yesterday to the day before.
The other options are wrong as did, yesterday, and did she can't be used.
The correct answer is C)He asked if she had met her the day before.