Choose the correct collective noun from the options below and fill in the blanks.

An ____ of thunder rumbled in the distance.

Peal

The correct collective noun for the sound of thunder is "Peal." OPTION 4

Explanation:

Echo refers to the reflection of sound.

Army typically refers to a large group of soldiers.

Squadron usually refers to a military unit or a group of aircraft.

Peal specifically refers to a loud prolonged sound, such as that of thunder.

So, the correct sentence would be: "An peal of thunder rumbled in the distance."