The correct answer is C) Date October 9. The "D0910" flashing light signal indicates the date, with the first two digits representing the month and the last two digits representing the day. Therefore, "D0910" corresponds to October 9. The other answer choices are incorrect because they do not accurately represent the meaning of the "D0910" signal. Option A) Date September 10 is incorrect, as the signal indicates October 9. Option B) Distance 910 miles is incorrect, as the signal does not convey distance information. Option D) Longitude 9°10' is also incorrect, as the signal is not related to geographic coordinates.