Which of the following is the best example of a hypothesis?
glass breaks when you throw a rock at it.
if three or more pounds of pressure is placed on glass, then it will break.
if i push hard on glass it will break.
when glass breaks it is because something was thrown at it.

If three or more pounds of pressure is placed on glass, then it will break.

Explanation:

This is a hypothesis because it is a statement that can be tested and can be drawn a conclusion from, as you can see the others can be tested but then you have too many factors that are not taken care of, for example how big will the rock you throw to the glass be, glasses cna break because of changes in temperature, and other factors that weren´t taken into account when doing them that the only one that could work as a hypothesis would be: If three or more pounds of pressure is placed on glass, then it will break.