I wrote him a letter to show my of his thoughtfulness.A. achievementB. agreementC. attenti

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A. achievement
B. agreement
C. attention
(答案→)D. appreciation
解析：appreciation 指充分理解后作出的赞美，或以热情赞同、衷心欣赏、真诚感激做出的某种反应，意为“赞赏、感激”；句子意思：我写信给他对他周到的考虑表示真诚的感激。
A.意为“成就”；B.意为“同意”；C.意为“注意”。