The correct answer is: A. returns a new list that is equal to by copying the top-level element of
The function (copy-list) takes a list as its argument and returns a new list that is equal to the original list, except that the top-level element of the new list is a copy of the top-level element of the original list.
For example, if the original list is (1 2 3), then the new list returned by (copy-list (1 2 3)) will be (1 2 3).
The other options are incorrect.
Option B is incorrect because (copy-list) does not return the length of the list.
Option C is incorrect because (copy-list) does not return t if the list is empty.
Option D is incorrect because (copy-list) does not do all of the above.