The following sentence communicates a(n) tone.
"this movement is nourished by the contemporary frustration over the continued existence of racial discrimination."
a. refreshing
b. obsessive
c. informative
d. easygoing

Very informative, the word frustration explains a problem that overwhelms the writer, the words continued existence means that the problem lingers on and isn't going away, and racial discrimination is directly telling me the root of the problem: the tension between different races due to discrimination. Discrimination existing means that some unfair or unjust treatment is ongoing.