Final answer:
The ending of the novel 'Passing' by Nella Larsen is left open to interpretation, with possible theories suggesting that Irene either witnesses Clare's fall or intentionally causes it.
Step-by-step explanation:
In the novel Passing by Nella Larsen, the ending is left open to interpretation, with no definitive answer to what exactly happens. However, there are several theories about what could have occurred. One theory is that Irene, the protagonist, witnesses Clare's fall from the window and realizes the danger and consequences of the passing lifestyle. This theory is supported by the line in the text where Irene thinks to herself, "Her face must have been pale—it must have been." Another theory is that Irene purposely pushes Clare out of the window due to jealousy and a desire to protect her own position in society. This theory is backed up by the tense atmosphere throughout the novel and the resentment that Irene feels towards Clare.