 Before Bassanio agrees, he ensures that Gratiano will behave himself in front of Portia and the other inhabitants of Belmont.In Act III, Scene II, Bassanio finally reaches Belmont, and Portia urges him to wait before choosing between the three caskets that determine if he gets to marry her.Bassanio reasons through his choices and decides to choose the casket of lead because it is a humble choice.