Answer: Walter's decision to move into the house.
"A Raisin in the Sun" is a play by Lorraine Hansberry that debuted in 1959.
In this part of the play, Walter is sure he wants to take the money that is being offered to them as a buyout, while the three women are horrified at this action, as this is a way of telling them they are not welcome in a white neighbourhood. However, he redeems himself near the end by saying that he will not take the money and that they should instead move into the new house. This event is meant to create a triumphant aesthetic impact.