The essential difference between grammar and lexicology is that the former deals with  _ _ _ _ _ _ _  of words and the latter with _ _ _ _ _ _ _ of words.

• A、

  meanings; forms and structures  

  
  

• B、

  forms and structures; meanings 

  
  

• C、

  forms; structures and meanings 

  
  

• D、

  meanings and forms; structures