Which of the Following Best Explains the Difference Between the Heavy-Element

Which of the following best explains the difference between the heavy-element abundances seen in the first stars and those seen in stars that we observe today?

A) Stars today have more heavy elements because modern stars have higher masses, allowing them to create more heavy elements through nuclear fusion.
B) Stars today have more heavy elements because the gas that formed the current stars was enriched by the higher-mass elements formed in previous generations of stars.
C) Stars today have fewer heavy elements because they have been around long enough to use up the larger atoms.
D) Stars today have a smaller abundance of heavy elements because they haven't been around long enough to make as many of the larger atoms.
E) The stars that astronomers observe now are the first generation of stars.