Concept:The sentence expresses a wish about a past action that did not happen before another past event.Explanation:The expression “How I wish” is used to talk about a regretted or unreal situation.Since the event “Tunde arrived” is in the past, the action of seeing must refer to a time before that past moment.To show an action completed before another past action, we use the past perfect tense: “had + past participle.”Therefore, the correct verb form is “had seen.”The other options are incorrect because “sees” and “has seen” are not past forms, and “saw” does not show the earlier past time clearly.Answer:B. had seen