Do things more efficiently. Decide which things don't need doing. Cut down on time wasters. Both A and C are correct. Good nutrition can help prevent some diseases.
Bad nutrition can cause some diseases.
Good nutrition can increase wellness and make you feel better. Good nutrition can be a treatment for some diseases. You need quite a lot of money to be stress-free. Being in control of your finances may prevent some of the stresses involved with overspending or worrying about bills. Creating a budget causes stress in most families.