Respuesta :
Hello there. I just took the test and the answer is in fact B. "these illustrations show the homologous forelimbs of four different species with enough similarities to suggest all had a common ancestor"
Explanation: Common descent is a concept that is effect of speciation which is related to an evolutionary process that was first put into thought by Charles Darwin, the naturalist who came up with the idea of natural selection. Hope this helps and have a great day!