The correct answer is D) Immediately alter course to the right to bring the range in line. The reasoning is that when running on a range, the vessel should steer to keep the range line centered and in line. Since the range line is 133°T and the vessel is steering 129°T, the vessel is to the left of the range line. To bring the range back in line, the vessel should immediately alter course to the right to 133°T. The other options are incorrect because: A) Altering to the left would take the vessel further off the range line; B) Altering to 133°T without the range closing would put the vessel off the range line; C) Continuing on the present heading would keep the vessel off the range line.