Verb and Tense form

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Verb and Tense form

by BTGmoderatorRO » Thu Sep 14, 2017 1:32 pm
After the war ended, the ministers believed they had drafted a treaty that would ensure permanent peace.
(A) would ensure permanent peace
(B) would have ensured permanent peace
(C) ensured permanent peace
(D) will ensure permanent peace
(E) should ensure permanent peace

What is the correct option and what is your backup to support your claim