The best description of Ida B. Wells' contributions to social justice and anti-lynching efforts is:
"She used investigative journalism to document and expose the widespread practice of lynching in the United States, mobilizing public opinion against racial violence."
Wells was a pioneering journalist who wrote extensively about lynching, providing evidence and compelling narratives that highlighted the brutality of racial violence against African Americans. Her work was crucial in raising awareness and mobilizing support for anti-lynching campaigns.