Final answer:
The woman betrayed Muhammad by poisoning the food at a meal she prepared for him and his followers.
Step-by-step explanation:
The historical event described refers to the incident involving a woman named Umrah bint Uqba during a peace negotiation known as the Treaty of Hudaybiyyah between Prophet Muhammad and the Quraysh tribe in 628 CE.
Umrah bint Uqba, representing the Quraysh tribe, invited Muhammad and his followers for a peace negotiation. During the negotiations, Umrah pledged her support and allegiance to Muhammad and his followers. However, when the peace talks concluded and Muhammad and his followers were about to enter Mecca for religious pilgrimage (Umrah), the Quraysh breached the treaty. Consequently, the woman's initial pledge of support during the negotiations did not materialize, and she did not fulfill her promise. Instead, the Quraysh prevented Muhammad and his followers from completing their pilgrimage and returning to Mecca as agreed upon in the treaty.
Therefore, the most accurate answer to the question is:
1) She betrayed Muhammad and his followers.