Answer: In paragraph 11, what is implied by the sentences "As Chao entered the forest, flocks of birds and packs of creatures approached him. He trembled like a leaf in the wind" is that B) Chao was so nervous that he was shaking.
Step-by-step explanation: The two sentences provided imply that Chao was scared of the creatures that approached him, that is to say he feared the creatures that moved close to him when he entered the forest. As a result of having his nerves on edge, he started shaking. In that way, the writer used the idiomatic expression "he trembled like a leaf in the wind" in order to convey this idea associated with Chao's feelings.