不明白C为什么不对

问题如下：

What is a decentralized autonomous organization?

选项：

A.

A corporation governed by a board of directors.

B.

An organization represented by a computer code and governed by smart contracts.

C.

A decentralized exchange for cryptocurrencies.

D.

A stablecoin issuer that uses tokens for governance.

解释：

DAO, or decentralized autonomous organization, is an organization represented by a computer code, with rules and transactions maintained on a blockchain, and governed by smart contracts. The example of MakerDAO, the issuer of the stablecoin Dai, which is governed by stakeholders who use tokens to help make decisions over protocol changes. Therefore, option B, "An organization represented by a computer code and governed by smart contracts," is the correct answer. Option A, "A corporation governed by a board of directors," is incorrect because the passage explains that DAOs replace the traditional top-down structure with a decentralized consensus-based model. Option C, "A decentralized exchange for cryptocurrencies," is incorrect because the passage gives the example of Uniswap as a decentralized exchange, not a DAO. Option D, "A stablecoin issuer that uses tokens for governance," is partially correct, but it only describes one example of a DAO and not the general concept.