You are likely to see a connotation used in both advertisement and also some university lectures. If only one answer is permitted, B is the best answer.
Simple. Air has mass. And if air has mass it also has weight. You can feel air when the wind blows. Or do an experiment. Weigh an empty container. Then pump it to a vacuum. Weigh it again. The difference is the weight of the air inside.
Vitamins. A lot of coenzymes are derivatives os vitamins especially B vitamins.
Hope this helps:)
