Patrick Has a Business Net Operating Loss of $70,000 in 2017.Patrick's

Patrick has a business net operating loss of $70,000 in 2017.Patrick's business generated significant taxable profits in 2015 and in 2016.Which of the following is true? ​

A) Patrick may offset income he generated in 2015 and 2016 with 2017's net operating loss by carrying the net operating loss back to each of those tax years.The remaining net operating loss (if any) can be carried forward and used to offset future taxable income.
B) Patrick may use the net operating loss to offset income from any year he chooses.
C) Net operating losses can offset only future income.
D) Patrick may elect to offset the income he generated in 2016 with 2017's net operating loss.The remaining net operating loss (if any) can be used to offset future taxable income.
E) None of the above.