MacDonald argues that the inability to apply tests to dreams "is logical, not physical or psychological. But when it is logically impossible that tests which prevent or correct mistake should be applied then it is nonsensical to assert that mistake can occur. No one can be deceived where no distinction can be made between what is and is not deceptive." Therefore, ...
A) neither dreams nor illusions are subject to testing for errors.
B) a dreamer is neither correct nor mistaken about what he dreams.
C) a dream can depict actually occurring phenomena.
D) dreams and illusions are logically identical.

Question

Quizplus · Accepted Answer

MacDonald's argument is that it is logically impossible to test dreams for errors, therefore it is nonsensical to assert that mistakes can occur within a dream. This means that a dreamer cannot be correct or mistaken about what they are dreaming as there is no way to test it.

MacDonald Argues That the Inability to Apply Tests to Dreams