The best example of matter from the given options is none other than A. Oxygen gas.
What is matter?
Matter is defined as any substance or material that not only has mass, but has volume as well which means that it can take up space.
Oxygen gas has both mass and can take up space where the other options can not because they are forms of energy.
Find out more on matter at https://brainly.com/question/3998772.
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