Why Did Photographers Walker Evans and Dorothea Lange Primarily Choose

Why did photographers Walker Evans and Dorothea Lange primarily choose to portray Alabama farmer Floyd Burroughs and "Migrant Mother" Florence Thompson in such serious poses?

A) The photographers wanted to document how hard their subjects worked in order to support their families despite their poverty during the Great Depression.
B) The solitary poses depicted their individualism that proved they were too proud to rely on federal aid.
C) Their seriousness was meant to convey their hostility to the upper class that put them in this situation.
D) They were depicted as neither smiling nor being angry to prove they were not responsible for their poverty and misery.