Stainless steel is material commonly used for temperatures up to 50℃; beyond that and for

Stainless steel is material commonly used for temperatures up to 50℃; beyond that and for severe corrosive conditions other materials are requiredThe bold and italic word “that” probably means _____.

A.stainless steel

B.temperature

C.50℃

D.other materials

请帮忙给出正确答案和分析，谢谢！