为何选用such that?

有读者问: 有一道选择题:

(1)Working conditions in that factory are_________few workers stay longer than three hours.

A. that B. such that C. so that D. so as

请问为什么选B?

只有such that是正确的,它不但符合语法也符合题意。be such that...并不乏例,再如:

(2)His anger was such that he lost control of himself.

(3)Their diet was such that they weren't getting the necessary vitamins.