Throughout evolutionary history there have been approximately 350 members of the order proboscidea. the only three species from this order still living are the asian elephant and two species of african elephants. the african elephants evolved most recently, about 1.5 million years ago. both asian and african elephants have lobes of flesh on the tips of their trunks that they use for grasping food and other objects. asian elephants have one of these lobes, while african elephants are more efficient because they have two. the image below shows the difference. what is the most likely cause of this variation between asian and african elephants? a. african elephants used their trunks for grasping more than asian elephants did, so their dna mutated and caused their trunks to develop differently. b. multiple african elephants developed mutations in the cells of their trunk from prolonged exposure to direct sunlight, causing the lobe duplication, and passed this mutation on to their offspring. c. several african elephants all developed the same mutation at the same time, which caused them to use their trunk more efficiently. d. an individual african elephant had an error occur during dna replication that resulted in a trunk with a selective advantage, and passed this mutation on to its offspring.