During which phase of the moon do neap tides occur?

The answer is during the moon's Quarter Phases                              

Explanation:

During the moon's quarter phases the sun and moon work at right angles, making the bulges to cancel each other. The result is a smaller variation between high and low tides. This is known as a Neap tide.

Neap tides are particularly weak tides. They occur when the gravitational forces of the Moon and the Sun are perpendicular to one another (with respect to the Earth). Neap tides occur during quarter moons.

What is a Bulge?

Earth's gravitational pull is so powerful that it creates a small bulge on the surface of the moon.

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b. a lightning bug, plug of grass, and a worm