6) The Underground Railway was a) never effective at freeing slaves because of the internal bickering that constantly took place among its leaders

b) only active for 3-4 years before it was discovered and shut down

c) effective at removing slaves but often re-enslaved the freedman once they got North

d) successful in helping approximately 50,000 slaves escape from bondage​

d is the answer. leo should include the source.

i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.

i wrote in correct journal format.

i wrote from the point of view of someone who is living in west berlin during the airlift.

i included details about what life was like in west berlin during the airlift.

i describe   what happened during the airlift.