Self-referential multiple-choice test

Seth sez. "This is a multiple-choice standardized test where (almost) all the questions are about the test itself. Since it's possible to get 20 out of 20, the test is actually a logic puzzle. And it's fun."

1. The first question whose answer is B is question: (A) 1
(B) 2
(C) 3
(D) 4
(E) 5

17. The answer to question 6 is:
(A) C
(B) D
(C) E
(D) none of the above
(E) all of the above

19. The answer to this question is:
(A) A
(B) B
(C) C
(D) D
(E) E

Link

(Thanks, Seth!)

Update: Andy points us to an interactive version that tells you if it's internally consistent.