You find a ball, which you mistakenly think is yours, in a bad lie. You declare the ball unplayable, drop it within two club lengths and play it. After your shot you find your original ball. Under the Rules you can

A. Give yourself a two-stroke penalty for substituting a ball and continue playing.

B. Take a two-stroke penalty and play your original ball, ignoring the strokes played with the wrong ball.

C. Add three strokes to your score (one for a lost ball and two for playing from the wrong place) and continue playing the substitute ball.

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