Answer: C) nearly 0% hydrogen Hydrogen plays a very significant part in the existence of stars around nebulae. A vast amount of hydrogen is needed for stars to be born. Hydrogen heats up and ignites due to a chain reaction from the collision of atoms but since there is no gravity acting upon the nebulae, it takes millions of years for the stars to exist. We can assume then that when the stars are born they contain 100% hydrogen. As they age, hydrogen is depleted. The oldest the star the least hydrogen it has. So the answer is C) nearly 0% hydrogen