Why can cloud computing be a challenge in relation to compliance risks (e.g. compliance with the Sarbanes-Oxley Act)?

Why can cloud computing be a challenge in relation to compliance risks (e.g. compliance with the Sarbanes-Oxley Act)?
A . It makes it harder to know where a company’s important assets are.
B . It is harder to limit the provider’s liability in the contract.
C . It makes it harder to know where a company’s physical assets are.
D . Industry regulations change more frequently to ensure compliance.

Answer: A