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Joann wanted to find out if her schoolmates owned pets. She stood at the entrance of the school and asked every fifth student, "Do you own a pet?" According to the results of her survey, 55% of the students own a pet.
Why is the sample or survey biased?
A. The survey influences students to say yes.
B. The sample only included club members.
C. The sample did not include students from all grades.
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