Question 1979Navigation General

The correct answer is B) Moon is new or full. Spring tides occur when the gravitational pull of the Moon and Sun are aligned, either when the Moon is new or full. This results in the highest (spring) and lowest (neap) tides. When the Moon is new or full, its gravitational pull combines with the Sun's pull, causing the oceans to bulge more than usual, creating spring tides. The other answer choices are incorrect because: A) the Moon's declination is not a factor in spring tides, C) the Sun and Moon being in quadrature (90 degrees apart) would create neap tides, and D) the Moon's quarter phases are not directly related to spring tides.