Which of these sentences is written following the standard rules of grammar and punctuation?

Which of these sentences is written following the standard rules of grammar and punctuation?
A . The bear settled in for its hibernation period after having stuffed itself with salmon and berries: two of the staple foods bears eat.
B . When she met the man of her dreams: it was just like in the fairy tales, the birds started singing and fireworks exploded in the sky.
C . Simone was hired to help the old woman shop for groceries, drive her to her doctor’s appointments, and spend time with her; she was not hired to clean the house or do the gardening.
D . Harold and Megan was flagged down on their way to the party by a driver whose car had died on the side of the road, they stopped to help.

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Answer: C