单选题 Lack of technological progress in the ancient and medieval worlds was primarily due to the absence of ______.

A、 natural resources
B、 inventive ability
C、 people's desire for the "better things of life"
D、 proper social organization

【正确答案】 D

【答案解析】合理的社会组织结构，在第三句话“there was a still greater obstacle to change until the very end of the middle ages: the organization of society.”中找到。A社会资源；B发明能力；C人们对于“更好生活”的渴望文中均未涉及。