The correct answer is B) they overturned several of President Johnson's vetoes.
Radical Republicans in Congress wanted to provide more rights for formerly enslaved people, so they overturned several of President Johnson's vetoes.
Since the beginning of his tenure, President Andrew Jackson had conflicts with Congress. Radical Republicans were in favor of giving some rights to African Americans but President Jackson vetoed their proposals. Hostilities between Jackson and members of Congress grew and in February 1868 the House of Representatives voted to impeach President Jackson. He was accused of many things, but mainly for violation of the Tenure of Office Act. Andrew Jackson was the first US President to be impeached. So yes, Radical Republicans in Congress wanted to provide more rights for formerly enslaved people, so they overturned several of President Johnson's vetoes.