The Holy Prophet (PBUH) covertly preached Islam for first three years at the house of ________ in Makkah?

A. Hazrat Abu Bakar (RA)
B. Hazrat Usman Ghani (RA)
C. Hazrat Arqam (RA)
D. Hazrat Khadijah (RA)

Submitted by: Engr. Faisal Nadeem Bhutto