Jack observed that he got rashes whenever he ate white berries he picked from his backyard. He concluded that eating white berries causes rashes. Which of the following statements will prove that there is a correlation and not causation between eating white berries and getting rashes?

The rashes are cured when Jack takes medicine.

Jack gets rashes only when he eats white berries picked from his backyard.

The white berries cause digestion problems which are manifested in the form of rashes.

The berry plant secretes a sap which causes rashes when it comes in contact with human skin.