Which of the Following Statements Regarding Net Operating Losses Generated

Which of the following statements regarding net operating losses generated in 2017 is true?

A) A corporation may elect to forgo carrying a net operating loss back and instead carry it over to future years.
B) Marginal tax rates are irrelevant in determining the tax benefit of applying a net operating loss carryback or carryover.
C) When a corporation applies a net operating loss carryover, it reports a favorable, permanent book-tax difference in the amount of the applied carryover.
D) Corporations can carry net operating losses back two years and forward up to 15 years.
E) None of these is a true statement.