Final answer:
Gurdwara Dehra Saheb is the place in Pakistan where Guru Arjan Dev Ji was martyred.
Step-by-step explanation:
The Gurdwara, now in Pakistan, that stands at the place where Guru Arjan Dev Ji was martyred is A) Dehra Saheb. While other Gurdwaras such as Panja Sahib, Nankana Sahib, and Kartarpur Sahib are significant in the Sikh religion, it is Gurdwara Dehra Saheb, also known as Gurdwara Dera Sahib Panthak Sahib, that marks the site of the martyrdom of Guru Arjan Dev Ji, the fifth Sikh Guru. This Gurdwara serves as a significant place of pilgrimage and reverence for Sikhs worldwide. Gurdwara Dehra Saheb is the place in Pakistan where Guru Arjan Dev Ji was martyred.