Answer:
A bee hive in a hollow tree
Step-by-step explanation:
Commensalism is a type of biological interaction in which one species is neither harmed nor benefited but the other organism is benefited. In the given question, the bees live in a colony with making a hive attached to the substratum.
The bees which make hives in the hollow space of the tree will be considered as a case of the commensalism as only this is the case in which both the things are living (biotic) and the bees can take nutrition from the flowers of the tree, the well protected shelter to make a hive and other benefits but the tree is neither benefited nor harmed.
Thus, the selected option is correct.