Passage: I was riding my bike around my house and noticed I had to peddle harder than I usually do . I got off my bike to see if everything was wrong . The front tire looked okay , the chain was still on the bike , but the back tire was flat unfortunately . I walked my bike back to my house because it is not safe to ride a bike with a flat tire . I connected the valve of the pump to the valve on the tire . I pumped the air pump and kept checking the tire to make sure it was working . It was hard work and it took longer than I thought . I put my ear next to it to see if I could hear any air coming out but I did n't hear any . I got back on my bike and it rode fine . Question: What was eventually filled with air? Option1: A bike tire Option2: pump
A bike tire