Ali said to Amina,"Sara will leave for Peshawar tomorrow."

Ali told Amina that Sara would leave for Peshawar the next day

Ali told Amina that Sara would be leaving for Peshawar the next day

Ali told Amina that Sara would leave for Peshawar the previous day

None of these

Explanation

If reported verb is in Past Tense, and reported speech is in Future Indefinite Tense, will changes into would & shall changes into should.