In the first paragraph, the author uses the word "seem" instead of "is", which is more accurate. What are the textual evidence (文本证据) that show his son is not necessarily allergic to English grammar?
A. Curious about my correction, he asked me what an adverb was.(para.9)
B. It led to his asking me what a verb was.(para. 9)
C. He became attracted to the idea of action words.(para. 10)
D. Then, out of his own curiosity, he asked me if other words had names for their use and functions.(para. 10)