It is everybody’s desire that every effort___________ to reduce the pollution in our city.

A．was made

B．be made

C．will be made

D．would be made

如图是患甲病（显性基因为A，隐性基因为a）和乙病（显性基因为B，隐性基因为b）两种遗传病的系谱图。据图回答：

据查3号不携带乙病致病基因，则乙病的致病基因位于（）染色体上，为（）性遗传。