In this scene, Benetha is talking to Mama about Asagai's proposal. Asagai, previously, had asked Beneatha to marry him and offered her to go to Africa with him. Mama seems distracted, most likely due to the fact that she is excited and ready to leave their apartment. Beneatha tries to continue the conversation, but is interrupted by Walter. Walter proceeds to say that she should marry George Murchison. Beneatha gets angry with him, and tell him she would never. They continue to bicker and exit the scene.
Mama, Asagai asked me to marry him today and go to Africa-
He Did? You ain't old enough to marry nobody. Darling, that ain't no bale of cotton, please handle it so we can sit in it again! I had that chair twenty five years....
Yes, baby -
To go to Africa, Mama - be a doctor in Africa. . .
What he want you to go to Africa for?
To practice there. . .
Girl, if you don't get all them silly ideas out your head! You better marry yourself a man with some loot . . .
What have you got to do with who I marry!
Plenty. Now I think George Murchison-
GEORGE MURCHISON! I wouldn't marry him if he were Adam and I was Eve.