Question 1988Navigation General

The correct answer is C) when the Moon is at quadrature. Neap tides occur when the gravitational pull of the Sun and Moon are at right angles to each other (the Moon is at quadrature). This reduces the difference between high and low tides, resulting in smaller tidal ranges. This happens approximately every 7 days, or at the first and last quarter moons. The other options are incorrect: A) is incorrect because this describes spring tides, not neap tides. B) is incorrect because neap tides occur more frequently than every 28 days. D) is incorrect because neap tides do not occur specifically at new or full moons.