The correct option is C Guru ji rejected the offer of marriage of Chandu Shah's daughter with his son, Sri hargobind Ji.
Chandu Diwan belonged to the same caste which the gurus belonged. He wanted a matrimonial alliance in the house of Guru and wanted to give his daughter in marriage to Guru's son, Sri hargobind ji. His offer was rejected by the guru so Chandu was in opposition of Guru Arjan Dev ji.