Answer:

The ball was in play when dropped in a wrong place and therefore Player A incurs a one-stroke penalty under Rule 18-2b in addition to the one-stroke penalty for a ball unplayable. Rule 20-6 permits Player A to lift the ball without penalty and proceed correctly under Rule 28 – any of the options are available. [As noted in Decision 20-3a/3 (New 2008), it is not required to replace the ball prior to proceeding under Rule 20-6.]