The discovery of glass being expandable and able to be shaped by human breath revolutionized

glassworking to such an extent that today "glassblowing" has become the generic term for all

glassworking, whether the glass is blown or formed by other techniques.

(A) of glass being expandable and able to be

(B) of glass that is capable of expansion and

(C) of glass being capable of expansion and that it can be

(D) that glass can be expanded and it is able to be

(E) that glass can be expanded and

不纠结答案！
看B选项的that指代是什么呀？

希望大家帮帮我，我纠结很久了！