A

问题如下：

Q. A key difference between digital assets and traditional financial assets is that:

选项：

A.digital assets are usually subject to a well-defined set of regulations.

B.transactions in digital assets are most likely kept on private centralized ledgers.

C.digital assets are valued not on their earnings but on the expected price appreciation given supply limitation.

解释：

The correct answer is C. Unlike traditional financial assets, most digital assets do not have an inherent value based on underlying assets or the potential cash flow or earnings they are expected to generate. Digital asset transactions are usually kept on decentralized digital ledgers using cryptography and algorithms without any central intermediaries. Regulations around digital assets are also ambiguous and evolving, unlike most traditional financial assets, which are subject to a well-defined set of regulations.