Answer:
The correct option is D. A new trait
Step-by-step explanation:
A cladogram can be described as a diagram which depicts the evolutionary similarities and differences among different species.
Whenever a new trait is seen in an organism, a branch is made in the cladogram to depict that change from others. The organisms that are similar or share evolutionary history are termed as clades. Branches in between them depict the changes in these similar clades.