What is the highest capacity that has serie c2/c champions for the 2007-08 season?
CREATE TABLE "girone_b" (
  "club" text,
  "city" text,
  "stadium" text,
  "capacity" real,
  "2007_08_season" text
);
SELECT MAX("capacity") FROM "girone_b" WHERE "2007_08_season"='serie c2/c champions';