Question

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Explanation:

Question 3:

The phrase "haunts every modern scientist" uses figurative language to mean Hans's abilities are so notable that they remain a topic of interest/study for current scientists. Option C matches this meaning.

Question 4 (Part A):

Wilhelm von Osten's actions (teaching the horse to count, using alphabet boards) and his initial curiosity about animal learning show he sincerely believed animals could learn. Option C aligns with this.

Question 5 (Part B):

To support that von Osten honestly believed animals could learn, the quotation stating his core curiosity about teaching animals numbers (Option A) directly reflects his foundational idea. His teaching actions (Options C, D) show his effort to test this belief, but Option A best establishes his initial genuine interest.

Answer:

1. C. Hans's abilities are so interesting that they are still studied by scientists today
2. C. Wilhelm von Osten was fascinated by animals and honestly believed that they could learn.
3. A. "Hans belonged to a retired schoolteacher named Wilhelm von Osten, who was curious about whether animals could be taught to understand numbers." (paragraph 2)