B) option is correct
Step-by-step explanation:
Parallel evolution is a type of evolution in which two species evolve from a common ancestor sharing common characters and function is called parallel evolution
The species which evolve through parallel evolution are called sibling species
In the given example of mammals, placentals and marsupials both are mammals and share a common ancestor and function which followed independent pathways after the break up of Gondwanaland, so this reflects parallel evolution