Multi-select problem: How does the next paragraph end?

How to choose what color to wear
Check the color of your veins to determine your skin tone.
Take a look at the color of the most prominent veins in your wrist. If your veins look purple or blue, you have cool skin.

Available choices:
(I) If your veins look blotchy or mottled, you have cool skin. Identify the most prominent veins in your wrist by noticing their color and then look for other colors..
(II) If they look greenish, you have warm skin. If you can't determine the color of your veins, or if blue and green are both represented, you probably have a neutral skin tone..
(III) If you have white veins, you have warm skin. If you have light veins, you have neutral skin..
(IV) If they look greenish, you have very warm skin. Cool skin tones generally have a green undertone, though..
(II)