Some companies have introduced flexible working hours with less

Some companies have introduced flexible working hours with less emphasis on pressure（）

than more on efficiency

than on efficiency

and more than efficiency 

and more efficiency

句意：一些公司引入了灵活的工作时间，较少强调压力，而是注重效率。前文中有表示比较程度的词less，故用than连接，排除CD。B项符合题意；若选A，需将than改为and。