Question 648Navigation General

The correct answer is A) 3°27'W. To arrive at this answer, we need to calculate the variation in 1991 based on the given information: - The variation was 3°45'W in 1988 - The annual change is decreasing by 6' - The question asks for the variation in 1991, which is 3 years after 1988 To find the variation in 1991, we need to subtract the change in variation over the 3-year period from the 1988 value. The change in variation is 3 years x 6' per year = 18', which is 0°18'. Subtracting this from the 1988 value of 3°45'W gives us the 1991 variation of 3°27'W. The other answer choices are incorrect because they do not properly account for the decreasing annual change in variation. Option B is incorrect because it assumes the variation is eastward, option C assumes the variation increased, and option D also assumes an eastward variation.