48Answer the question：
What is the maximum manoeuvring power ahead？"
(A) The maximum manoeuvring power ahead is 20 knots.
(B) The maximum manoeuvring power ahead is 100 revolutions.
(C) The maximum manoeuvring power ahead is 2000 tons.
(D) The maximum manoeuvring power ahead is 5000 kilowatts.
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