This question tests AP Japanese skills: recognizing and self-correcting language errors in written exchanges. Students must identify errors in grammar, vocabulary, or politeness level and correct them. In Japanese, verb conjugations and kanji are common areas of error. Understanding context is crucial for appropriate language use. In this formal email to a teacher, the casual expression '会える？' is inappropriate and should be replaced with respectful language. The sentence requires humble form since the writer is requesting to meet the teacher. Choice C is correct because 'お会いできますでしょうか' uses the humble form お会いする and the extra-polite でしょうか, appropriate for a formal request to a teacher. Choice B is incorrect because while 'できますか' is polite, it lacks the humble form needed when the writer's action affects the teacher. To help students: Practice identifying when to use humble forms (お/ご + verb stem + する) versus honorific forms. Create exercises for converting casual requests to appropriate formal levels. Watch for: using only polite forms when humble forms are required in formal contexts.