Who were the Opponents in the final that played on a carpet (i) Surface?
CREATE TABLE "doubles_8" (
  "tournament" text,
  "surface" text,
  "partner" text,
  "opponents_in_the_final" text,
  "score_in_the_final" text
);
SELECT "opponents_in_the_final" FROM "doubles_8" WHERE "surface"='carpet (i)';