Take a look at the statement below:

fish meal is better than artificial fertilizers.

how could this statement be revised to make it a hypothesis?

fish meal is safer than artificial fertilizers, but it does not make plants grow.
fish meal is a better fertilizer than artificial fertilizer because fish meal is natural.
plants that are fertilized with fish meal will grow taller than plants that receive artificial fertilizer.
plants that receive artificial fertilizer will be better than plants that receive fish meal.

Plants that are fertilized with fish meal will grow taller than plants that receive artificial fertilizer.

Explanation:

A hypothesis can be define as the proposed assumption for a particular natural phenomena. The facts and evidences proposed in the hypothesis are  required to be tested and verified by using a suitable scientific methodology.

Plants that are fertilized with fish meal will grow taller than plants that receive artificial fertilizer. is the correct option. This is because of the fact that a particular hypothesis includes some facts which are required to be verified by scientific methodology.