Which option is written correctly and contains an instance of contested usage?

a. “since the forecast calls for rain, nobody with any sense isn’t going hiking.”
the sentence contains a double negative.

b.“my brother called to say he needed a ride, but he didn’t say where he was calling from.”
the sentence ends with a preposition.

c.“my sister and brother changed their minds about coming to visit over the holidays.”
the sentence uses the possessive pronoun “their” for a singular antecedent.

d.“so that he would not be disturbed, i tried to uncover carefully the sleeping baby.”
the sentence contains a split infinitive.