—What about Mary's idea?

—Very good! But not many people __________ the idea that money brings happiness. [ ]

A. subscribe to  

B. take to

C. contribute to 

D. relate to

易爆介质是指气体或液体的蒸汽、薄雾与空气混合形成的爆炸混合物，并且其爆炸下限≤10%，或者爆炸上限和爆炸下限的差值大于20%的介质。