What is the Primary Sponsor for the team owned by Randy Humphrey?
CREATE TABLE "part_time_teams" (
  "team" text,
  "car_s" text,
  "driver_s" text,
  "primary_sponsor_s" text,
  "owner_s" text,
  "crew_chief" text,
  "rounds" real
);
SELECT "primary_sponsor_s" FROM "part_time_teams" WHERE "owner_s"='randy humphrey';