This math problem is________ than that one．

A．much easy

B．much easier

C．very easier

D．the easiest

This math problem is ________ than that one．

A．the easiest

B．much easier

C．much easy

D．very easy

This math problem is ________ that one．

A．so easy as

B．as difficult as

C．much difficult than

D．less easier than