If you enter an intersection to make a left turn, but oncoming traffic prevents the turn immediately, what should you do?

• Complete the turn as quickly as possible
  Explanation:

  "For any left turn, the law requires you to yield to any traffic headed toward you that is close enough to be a hazard. Wait for traffic to pass before you turn left."
• Signal your intention to turn left and wait in the intersection until it is safe to complete the turn
• Continue straight through the intersection and find a safe place to make a U-turn
• Reverse and back out of the intersection to wait for another opportunity to turn left