According to Current Understanding,how Did the First Generation of Stars

Multiple Choice

According to current understanding,how did the first generation of stars differ from stars born today?

A) They contained much more hydrogen and helium than stars born today.
B) They were much cooler in temperature than most stars born today.
C) They were much more likely to be members of binary star systems than stars are born today.
D) They were much more massive than most stars born today.