A flashing yellow arrow in the left turn lane indicates you may:

Answer: A — Slow down and turn when the intersection is clear

A flashing yellow left-turn signal means you may turn left, but only after slowing down and yielding to oncoming traffic and pedestrians. It’s a warning to proceed with caution, not a free pass to go immediately. Look for a safe gap in opposing traffic and crosswalk pedestrians, and complete the turn only when the intersection is clear. If traffic or pedestrians prevent a safe turn, wait until it’s safe. This fits because you’re allowed to turn left when safe, rather than requiring a full stop or forcing you to go straight or proceed without slowing.