Brain riddle! Right answer gets brainliest! On the first day of school, the history teacher was found dead. There were four suspects: the lunch lady, the janitor, the math teacher, and the principal. There albis were as follows:

Lunch Lady: I was preparing lunch for the kids!
Janitor: I was cleaning up some spilled food in the kindergarten room.
Math Teacher: I was correcting mid-year tests!
Principal: I was preparing the after-lunch announcements.

Who killed the history teacher?