Problem 5.
Correct answer is d
because APPEND concatenates two lists; the rest return (A (B)).
Note: (b) is missing an ending paren
(e) is missing a quote before b
Problem 14. Correct answer should be (10), not ((10)).
Problem 16. Correct answer should be 5,
as the binding for START is part of a closure for MAKE-COUNTER-BY-N,
and each of the two calls to MAKE-COUNTER-BY-N generates a separate binding
for N and for TOTAL.
Problem 17. The correct answer, 100, is missing from the
list of answers.