The first mosque built by Prophet Muhammad (PBUH) was in the year:

(A) 1 AH
(B) 2 AH
(C) 3 AH
(D) 4 AH

The answer is: (A) 1 AH
The first mosque built by Prophet Muhammad (PBUH) was in the first year of Hijrah. Its name is Masjid-e-Quba (or Quba Masjid).