Which Is an Example of a Clumped Distribution of a Population

Which is an example of a clumped distribution of a population?

A) A tree species releases a poison to defend the soil around its roots,resulting in trees spaced evenly like a grid.
B) Antelope travel in herds.
C) Two male hummingbirds have a confrontation on the border between their territories.
D) Multiple species join each other at the waterhole to drink.