Concept:The sentence expresses disbelief or surprise at a wasteful action.
Explanation:The phrase “It is most … that…” calls for a word meaning “extremely surprising” or “hard to believe.”
Spending five million naira on a fragile fence is shocking and unexpected.
Among the options, “astonishing” best conveys this strong surprise.
Words like “wonderful,” “remarkable,” and “outstanding” describe praise, not disbelief.
Therefore, the correct choice is option D.
Answer:D. astonishing