Final answer:
Isabel Bishop's 'Waiting' is part of the Social Realism branch of the American Scene movement, which showcases the lives and struggles of the working class in a realistic manner.
Step-by-step explanation:
Isabel Bishop's Waiting is part of the Social Realism branch of the American Scene movement. Social Realism is an artistic movement that depicts realistic portrayals of life and social issues with a focus on the working class. It is distinct from movements such as Precisionism, which celebrated American industry and the abstractions of shape and form; American Regionalism, which often showcased rural scenes and was part of the larger American Scene movement; and Abstract Expressionism, which emerged post-World War II and characterized a more avant-garde approach to painting.
Moreover, Social Realism differs from Naturalism and Romanticism, which both have different focuses; Naturalism often features impersonal depictions of characters in situations over which they have no control, while Romanticism glorifies nature, common people, exotic places, and the historical past.