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.

- "ethical issues. deception – the participants actually believed they were shocking a real person and were unaware the learner was a confederate of milgram's. however, milgram argued that “illusion is used when necessary in order to set the stage for the revelation of certain difficult-to-get-at-truths.” "

- "milgram's work was conducted in the early 1960s before the current.the studies ignited a debate about the ethical treatment of participants. what appear to be dangerous, if not deadly, electric shocks and the by today's ethical standards, many questions about the research have gone unanswered."