Read the paragraph.
my mom trusts me to prepare snacks in the toaster oven. it is easy to use, and my brothers and i have been making toast since we were five or six years old. when i was heating up a pizza roll the other day, i received a phone call from a friend. we talked for a while, and i lost track of time. my snack burned, and soon i heard a smoke alarm blaring. the kitchen was hazy with smoke.
what causes the smoke?
the toast
the brothers
the pizza roll
the fire alarm