Concept:The marriage of Prophet Muhammad (SAW) and Khadijah was blessed with six children in total.Explanation:Khadijah gave birth to two sons and four daughters.The two sons were Al-Qasim and Abdullah, and they both died at a young age.The four daughters were Zaynab, Ruqayyah, Umm Kulthūm, and Fāṭimah.So, the total number of children from the marriage is 2+4=6.Answer:C. six children