While inadequate infrastructure—in particular, poor roads and vehicles without modern safety equipment—plays a role in the high death toll, human error is an important contributor. What does “infrastructure” mean in this sentence?

A.the stock of basic facilities and capital equipment needed for the functioning of a country or area

B.the high death toll

C.human error as an important contributor

D.all of the above

正确答案：the stock of basic facilities and capital equipment needed for the functioning of a country or area