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Which sentence has an error in subject-verb agreement?

ASarah Conner, after playing with the neighborhood girls, fell asleep in the backyard hammock.
BThe teacher opened her door to find a police officer and drug dog outside waiting to come in.
CSome employers--in fact, those who often have families of their own--give out yearly Christmas bonuses.
DJoseph Schultz in the next apartment, as well as the entire Partridge family, have lived in our neighborhood since 1990.