Concept:The building of the Prophet's Mosque was a collective effort, but Islamic historical reports credit Ammar b. Yasir with being the first to begin the foundation.
Explanation:After the hijrah, Prophet Muhammad arrived in Madinah and the site for the mosque was chosen.
The Prophet directed the companions to take part in the construction work.
Ammar b. Yasir was the first person to start digging and laying the foundation.
He worked with great dedication, carrying stones and bricks alongside the other companions.
The Prophet also encouraged Ammar while he laboured on the groundwork.
None of the other listed companions, such as Abdullah b. Ubayy, Abu Ayyub al-Ansari, or Anas b. Malik, is recorded as the first to begin the foundation.
Therefore, the first person to begin the foundation of the Prophet's Mosque in Madinah was Ammar b. Yasir.
Answer:A. Ammar b. Yasir