单选题 Why did he find it more difficult to write orders?

A、 It needed the understanding of various military terms.
B、 The writing required more accuracy and conciseness.
C、 The different army units used diverse languages.
D、 The knowledge of army equipment was difficult to master.

【正确答案】 B

【答案解析】细节推论为什么 Harrison 发觉写像命令这样的科技文章时有一定的难度?根据文章的第二段， Harrison 根据自身的经历，总结了写作命令时所遇到的挑战：必须要明了、准确、连贯和简洁，这是科技写作所要满足的要求，同时也是挑战和难度。所以选项B为正确的答案。选项A、C和D文章没有提及。