Human beings are superior to animals ____they can use language as a tool to communicate.A in that B in which C for which D for that这个介词是为什么是in 选A

Human beings are superior to animals ____they can use language as a tool to communicate.
A in that B in which C for which D for that
这个介词是为什么是in
选A

in that 是固定搭配,意思是“因为”