Answer: "The static friction of the ketchup wil keep it from moving if it isnt too tightly adhered to the sides of the moving bottle"
Explanation:
We want to see why is that the ketchup does not move of the bottom of the bottle when we want to use it.
The options are:
Because of the weight.
Because of the static friction.
Because of the inertia.
Because of the kinetic friction.
First, we can discard weight and inertia, because these two things actually help to get the ketchup out of the bottle.
The remaining options are static friction and kinetic friction:
If the kinetic friction has an effect, it means that the ketchup inside the bottle is moving, so this option can also be discarded.
Then the correct option is static friction, which the ketchup does against the walls of the bottle and keeps it in place.