Answer:
c. We can never observe a necessary connection between events.
Step-by-step explanation:
Hume argues that assumptions of cause and effect between two events are not necessarily real or true. It is possible to deny causal connections without contradiction because causal connections are assumptions not subject to reason.
We cannot justify our assumptions about the future based on past experience unless there is a law that the future will always resemble the past. No such law exists. We can deny the relationship without contradiction and we cannot justify it with experience. Therefore, we have no rational support for believing in causation. Hume suggests that our assumptions are based on habit, not reason, and that, ultimately, our assumptions about matters of fact are based in probability.