GMAT Sentence Correction (SC) | Re: Dr. Sayres lecture recounted several little-known episodes

Hey All,

I got a message saying this one is three years old and waiting for me. Excitement!

254. Dr. Sayre’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
PROBLEM: Subject-verb agreement. The subject here is "episodes," which is plural, so we need "illustrate."

(B) relation of one nation with another