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【单选题】
有机合成材料的出现是材料发展史上的一次重大突破。人们常说的以石油化工为基础的三大合成材料是 [     ] ①合成塑料 ②医药 ③化肥 ④合成纤维 ⑤合成洗涤剂 ⑥合成橡胶
A.
①②④
B.
②④⑤
C.
①④⑥
D.
②③⑥
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