What’s in that tree——There are some birds in that treeA lts a bird B There are some birds C They are birds请问这道英语题目为什么选择B呢？

The correct answer is B because the question asks "what's in that tree?" which implies that there are multiple objects or creatures in the tree. Answer A, "It's a bird," suggests that there is only one bird in the tree, while answer C, "They are birds," implies that there are multiple trees with birds in them. Answer B, "There are some birds," accurately reflects that there are multiple birds in the tree.