Please help me on this

Which sentence has an adjective clause? a. mike rode his bike on mountain trails because he found them challenging. b.gary donated to charity whenever he could. c.liz, who could always make people laugh, was loved by the whole block. d.ever since adam was a little boy, he had his father in the fields

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After the doctors question their authenticity, the duke suggest that he and the king leave immediately with the money they have already stolen. why does the king refuse to leave