Sentence1: I went to babysit my 5-year-old nephew in San Francisco. Sentence2: My sister encouraged me to bike her kid to school. Sentence3: I was afraid to bike across the city with my nephew in tow. Sentence4: Instead, we biked through Golden Gate Park to the beach and the zoo. 
 (A) I do not have a sister. (B) We had a great time!
A