The correct answer is D. Insects lay eggs in the sloth's waste.
Step-by-step explanation:
Commensalism is a type of interaction between organisms of different species, in this, one organism benefits from another without causing any benefit or damage. Due to this, commensalism differs from other interactions such as parasitism in which one organism benefit from another and causes harm to it, or from mutualism as in this, the organisms involved obtain a benefit. This implies the one that is an example of commensalism is "Insects lay eggs in the sloth's waste" because in this relationship insects obtain a benefit that is a place to lay eggs while the sloth remains unaffected.