Change the direct narration into indirect narration:
Sangeet said, "I have already written a letter to my family in Dubai."
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 A is correct as the present perfect tense is changed to past perfect tense, I to he my to his and that is added to connect,
The other options are wrong as wrote, was writing, and will write can't be used.
The correct answer is A)Sangeet said that he had already written a letter to his family in Dubai.