Dr. Sayreâ€™s lecture recounted several little-known episodes in the relations between nations that illustrates
what is wrong with alliances and treaties that do not have popular support.
(A) relations between nations that illustrates
(B) relation of one nation with another that illustrates
(C) relations between nations that illustrate
(D) relation of one nation with another and illustrate
(E) relations of nations that illustrates
What is the subject here-
1 Episodes - I guess this is the one which illustrates--
Plz explain your answer.