A tree species in Mauritius failed to reproduce because of the extinction of a fruit eating bird. Which one of the following was that bird?

The correct answer is B because of the co-evolutionary relationship between the Dodo bird and the Calvaria tree, also known as the Tambalacoque tree. Scientists observed that the seeds of this tree had a very thick shell that needed to pass through the digestive system of the Dodo to be abraded by the bird's gizzard. This process, known as scarification, weakened the seed coat enough to allow germination. After the Dodo became extinct in the late 17th century, the seeds could no longer sprout naturally, leading to a decline in the population of these ancient trees. This is a classic example of an obligatory mutualism where the survival of a plant species was directly linked to a specific animal species.