Can u plz answer it plz plz

Which of the following is a testable hypotheses?

Why is the statement not a hypothesis? sunflowers require soil and plenty of sunlight and water to grow and thrive.

Internal feedback works to maintain homeostasis when your a. heart rate decreases as your white blood cells increase b. breathing rate decreases as your red blood cells decrease c. heart rate increases as your liver is cleaning blood d. breathing rate increases as your heart rate increases