A writer of mystery novels wants to portray something gruesome happening just as the full moon is at its highest point in the sky. What time of day will the gruesome event occur?

B) roughly midnight

Explanation:

The highest points of the moon vary according to the phase of the moon.

When the moon is full, it is rising in the sky around 6 pm, and at midnight it is at the highest point of the sky.

It sets down around 6 am.

The full moon occurs on the 14th day of the moon's path around the Earth when the moon is exactly 180 degrees from the sun and most visible from the Earth.