The best colors for a Sun umbrella would be option 4, which is white on top and black on the inside.

The purpose of a Sun umbrella is to provide shade and protect individuals from the sun`s rays. In order to effectively block the sun`s heat and light, it is best to choose light-colored or reflective materials.

White is a good choice for the top of the umbrella because it reflects sunlight, keeping the surface cooler and preventing the heat from transferring to the person under the umbrella. It also helps to keep the area shaded and cool.

On the inside, black is the preferable color as it absorbs light and heat. This helps to further prevent the sunlight from passing through the fabric and reaching the person under the umbrella. By absorbing the heat, black material prevents it from reaching the person and keeps them comfortable.

Alert - correct answer should be option 2. White on top and black on the inside is the best color combination for a sun umbrella because white reflects sunlight and keeps the surface cooler, while black on the inside absorbs light and heat, preventing it from reaching the person under the umbrella, and keeping them comfortable.