The author of the book ‘Aab-e-Hayat’ is__________?

A. Syed Ameer Ali
B. Hafiz Shirazi
C. Sir Syed Ahmed Khan
D. Maulana Muhammad Hussain Azad 

Aab-e hayat is a commentary (or tazkira) on Urdu poetry written by Muhammad Husain Azad in 1880.