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

A ____ of whales breached the surface of the ocean.

Pod

The correct collective noun for a group of whales is "Pod." OPTION 3

Explanation:

Army typically refers to a large group of soldiers.

Flock is usually used for birds, such as a flock of birds.

School is commonly used for fish, such as a school of fish.

Pod specifically refers to a group of whales.

So, the correct sentence would be: "An pod of whales breached the surface of the ocean."