Which of the Following Is Essential for a Work to Have

Which of the following is essential for a work to have copyright protection?

A) The idea on which the work is based must be original.
B) The creator of the work must register his or her work in Canada.
C) The subject matter of the work must only fall into either musical or artistic categories.
D) The expression of the idea must be an original product of the author's own skill.
E) The expression of the idea will generally be sufficient.