According to Form 20-F of the U.S. SEC

According to Form 20-F of the U.S. SEC,

A) U.S. firms are required to disclose the amount of their foreign earnings.
B) foreign firms are required to reconcile their earnings with what earnings would have been under U.S. GAAP.
C) foreign firms do not have to disclose the reasons why their GAAP differs from U.S. GAAP, only the amount of the difference.
D) the index of conservatism must be disclosed in order to determine the degree to which income differs under different GAAP.