Question

during which moon phases do spring tides occur, resulting in the highest high tides and lowest low tides?
first and third quarters
waxing and waning crescents
full and new moons
gibbous phases

Explanation:

Spring tides occur when the gravitational forces of the Sun and the Moon combine. This happens during the full - moon phase (when the Earth, Sun, and Moon are in a straight line with the Earth in the middle) and the new - moon phase (when the Moon is between the Earth and the Sun). During these times, the combined gravitational pull leads to the highest high tides and lowest low tides.

Answer:

C. Full and new moons