Your opponent's ball is about 10 yards ahead of yours. Because it's in your line of sight, you ask your opponent to lift his ball because it constitutes mental interference. Is this allowed?

A. No, it is never allowed.
B. Yes, but only if the interfering ball is within 10 yards of the other.
C. Yes, but only if both balls are on the green.
D. Yes, but only if there is a reasonable possibility that an opponent's ball may interfere with your shot, either physically or mentally.

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