Kindly help to explain this SC question

Kindly help to explain this question.

Q: The Olympic games helped to keep peace among the pugnacious stated of the Greek [u]world in that a sacred truce was proclaimed during the festival's month.[/u]

(A)world in that a sacred truce was proclaimed during the festival's month
(B)world, proclaiming a sacred truce during the festival's month
(C)world when they proclaimed a sacred truce for the festival month
(D)world, for a sacred truce was proclaimed during the month of the festival
(E)world by proclamation of a sacred truce that was for the month of festival