A、how thE prEsiDEnt proposEs nEw lAws.
B．how A Bill is pAssED By lAwmAkErs inCongrEss.
C、how thE prEsiDEnt CAn rEjECt A proposED lAw.
D．how lAwmAkErs CAn ForCE thE prEsiDEnt to sign A Bill.