Context: This picture shows a fossil of an ancient animal called Priscacara.
In some places, large numbers of Priscacara fossils have been found near each other. This suggests that Priscacara lived in groups.
Which trait did Priscacara have? Select the trait you can observe on the fossil.
A. a tail fin
B. a mostly silver body
From the given choices, choose the correct answer and respond with the letter of that choice.

A