How are solution useful for society

Solutions are basically a release from a problem. This is more than helpful. 

 To create a brighter future in which people lead better lives, society must find ways to resolve these pressing issues. At NEC we believe the know-how and technology we have accumulated throughout our 100-plus year history of innovation can make a genuine difference. We are committed to using our cutting-edge ICT (information and communications technology) to resolve various societal issues so this will help

I'd go for the one that says that knees are fulcrums, lower legs are levers and the ankles hold loads.hope it ,happy homework/ study/ exam!