This question is based on Buchi Emecheta's Second Class Citizen The main challenge Adah encounters in England is

In Buchi Emecheta's novel "Second Class Citizen," the main challenge Adah encounters in England is primarily related to her identity as a black person. This issue is multifaceted and compounded by the various forms of discrimination and prejudice she faces, such as racial discrimination and the cultural challenges associated with being an immigrant.

Adah experiences racial prejudice, which affects many aspects of her life, from finding housing to dealing with societal perceptions. Often, she is treated as a "second-class" citizen, which impacts her self-esteem and her ability to integrate fully into society. Additionally, she encounters stereotypes and expectations associated with her race, which compound her struggle for acceptance.

However, it is important to acknowledge that Adah's experiences are also shaped by intersecting challenges of being a woman in a patriarchal society and facing financial constraints. Yet, the primary hurdle remains the pervasive issue of racial discrimination, which influences most other challenges she encounters.