The correct options are
C Banda Singh Bahadur was a Maratha by birth but became a Sikh after meeting his Guru.
D The Hindu kings of the Shiwalik had supported the Mughals in the Battle of Lohgarh.
Guru Gobind Singh lost his two sons in the Battle of Anandpur and his other two sons were captured and presented in front of Wazir Khan, who bricked them.
Banda Singh Bahadur was also known as Madho Das, Lachman Das and Lachman Dev. He became a disciple of Guru Gobind Singh and accepted Sikhism.
The Hindu Kings of the Shiwalik had supported the Mughals with men and material in the Battle of Lohgarh and the Battle of Gurdas Nangal.