Which of the following situations would NOT satisfy the definition of (tortious) intent?

a-A mentally ill teenager greets his friend with a smile and slaps him hard on the back. The friend falls and breaks his collarbone.

b-A 6-year-old child playfully pulls a chair out from under an adult who is about to sit down.

c-As a man steps off a bus, his foot slips on a patch of ice and he falls onto a pedestrian.

d-A teenager pushes a classmate into another student.