Then Plutarch said...
"People who need a brain boost are seldom smart enough to know it."

[sigh] Darnit, Plutarch, 'fess up; you didn't take the test.
If you did you wouldn't commit redundantcy.

(a) Irony_______________________[ ]
(b) The horns of a dilemma________ [ ]
(c) A paradox____________________[ ]
(d) A self-fulfilling prophesy________[ ]

The answer is (d).