During which battle was the husband of Hafsa bint Umar (RA) martyred?

1. Battle of Badr
2. Battle of Uhud
3. Battle of Khaybar
4. Battle of Tabuk

Khunais bin Hudhafa, Hazrat Hafsa’s first husband, was martyred in the Battle of Uhud (625 CE). After his death, she married the Prophet (PBUH).