Hume argues that these things are fundamental to our daily experience that no sane person could possibly doubt them, yet they are completely without justification:. a. Principle of universal causation
b. Principle of induction
c. Belief in the external world
d. All of the above

Correct

b. Principle of induction

Explanation:

This was from his works on The Principle of Induction. The original problem of induction can be simply put, It concerns the support or justification of inductive methods; methods that predict or infer, in Hume's words, that “instances of which we have had no experience resemble those of which we have had experience.

explanation:

answer; one person; monarch;