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

An ____ of geckos appeared on the wall.

Cluster

The correct collective noun for a group of geckos is "Cluster." OPTION 4

Explanation:

Army typically refers to a large group of soldiers.

Flock is usually used for birds.

Herd is commonly used for large grazing animals like zebras or cattle.

Cluster is the appropriate term for a group of geckos, indicating a gathering or clustering together.

So, the correct sentence would be: "An cluster of geckos appeared on the wall."