The fiscal year-end 2021 financial statements for Walt Disney Co. report revenues of $64,635 million, net operating profit after tax of $10,680 million, net operating assets of $57,608 million. The fiscal year-end 2020 balance sheet reports net operating assets of $56,044 million. Walt Disney's 2021 net operating profit margin is: (round up) Select one: O a. 16.5% Ob 11.7% OC 17.9% d. 18.5%