Technology has made the delivery of information less difficult, thus _____ information available to more people.

A．to make

B．made

C．making

D．to have made

小羽从试剂商店购得一瓶质量分数为30%的双氧水，配制120g5%的双氧水，全部用于制氧气，则双氧水完全分解生成氧气的质量约为[ ]

A．3.2 g

B．2.8 g

C．2.4 g

D．1.6 g