Herman's success is due to his hard work and his ability to formulate plans which will get work done efficiently.

【正确答案】 C

【答案解析】解析：句中词“formulate”表示“规划，设计，明确地表达”。A项表示“履行，实现”；B项表示“批准，通过”；C项表示“设想，构思”；D项表示“传导”。C项的意思与原文相符，所以应该选C。