Members of congress signed the "southern manifesto" to

a.) encourage desegregation in public schools
b.) express their opposition to the brown ruling
c.) pledge support for the civil rights movement
d.) improve facilities in all-black schools

The Declaration of Constitutional Principles (recognized unceremoniously as the Southern Manifesto) was a text written in February and March 1956, in the United States Congress, in disagreement to ethnic incorporation of public places. The Congressmen just made a draft of the text to stand the milestone Supreme Court 1954 presiding Brown v. Board of Education, which resolute that separation of public schools was unconstitutional. So the answer B.