A Fisheries Biologist Tells You She Is Studying a Cohort

A fisheries biologist tells you she is studying a cohort of salmon returning to their birth river. What does this tell you about these salmon?

A) These salmon are iteroparous.
B) Most of these salmon are one or two years old.
C) All of these salmon are the same age.
D) This group of salmon show a uniform distribution.
E) The salmon are still too young for reproduction.