What are the titles of segment c for series episode is 21-08?
CREATE TABLE "season_21_2013" (
  "series_ep" text,
  "episode" real,
  "segment_a" text,
  "segment_b" text,
  "segment_c" text,
  "segment_d" text
);
SELECT "segment_c" FROM "season_21_2013" WHERE "series_ep"='21-08';