Pinpoint the very first convert to Islam among the following pious personalities...? Mcqs

Pinpoint the very first convert to Islam among the following pious personalities...?

(A) Hazrat Umer (May Allah bless Him)

(B) Hazrat Abu Bakr(May Allah bless Him)

(C) Hazrat Khadijah (May Allah bless Her)

(D) Hazrat Usman(May Allah bless Him)