CREATE TABLE table_38178 ("Round" TEXT, "Venue" TEXT, "Discipline" TEXT, "Date" TEXT, "Winner" TEXT, "Second" TEXT, "Third" TEXT)

What was the venue with a 3.3km c prologue discipline?
SELECT "Venue" FROM table_38178 WHERE "Discipline" = '3.3km c prologue'
SELECT "Venue" FROM "table_38178" WHERE "Discipline" = '3.3km c prologue'