Final answer:
A tenant or prospective tenant can lodge a housing discrimination complaint with the Secretary of HUD.
Step-by-step explanation:
To lodge a housing discrimination complaint, a tenant or prospective tenant can file a complaint with the Secretary of HUD (Department of Housing and Urban Development).
Option A, the Secretary of HUD, is the correct answer. The Secretary of HUD is responsible for investigating and resolving complaints related to housing discrimination. They have the authority to take legal action against individuals or organizations found to be engaging in discriminatory practices.