C. Sally didn't go to school because... 1) she had to go to the zoo. 2) she didn't like Geography. 3) she had a cold. 4) she was walking in the park.

Чтобы ответить на вопрос, обратимся к тексту. В тексте написано: "The day before yesterday when I was going to the library, it started raining heavily and I didn't have my umbrella, so I got wet to the skin. I got a cold and I missed my classes at school yesterday."

Из этого предложения следует, что Салли пропустила занятия в школе, потому что простудилась.

Ответ: 3) she had a cold.