When Collecting Sea Urchins for an Experiment on Fertilization That

When collecting sea urchins for an experiment on fertilization that you will conduct back in your lab, you carefully put each sea urchin into a separate container of seawater on a bed of seaweed.The main reason for isolating the individuals is that, if carried together in a single container,

A) they are likely to cannibalize each other.
B) they are likely to infect each other with parasites they are carrying.
C) one sea urchin spawning will likely induce the others to spawn.
D) it will be more difficult to sex the individuals.
E) they are likely to fight as they defend their own territories.