Final answer:
Guru Arjan Dev Ji was the guru who was seated on a red-hot iron plate and burning hot sand was put on his body.
Correct option is A.
Step-by-step explanation:
The guru who was seated on a red-hot iron plate and had burning hot sand put on his body was Guru Arjan Dev Ji. Guru Arjan Dev Ji was the fifth Sikh Guru and he faced severe persecution under the Mughal emperor Jahangir.