Does toast always land butter side down? 19 May 2014

In Maths in Kenwyn Class, we are learning about probability. We hypothesised that there is a good chance that a dropped slice of toast will land butter-side down. After 10 drops, it landed butter-side down every time!

That suggests that the probability of it landing butter-side down is actually:

a. even chance

b. impossible

c. certain

What do you think? Please explain why.