While increased creditworthiness is generally a positive attribute, it is not a criterion for a contract or product that can be cleared in exchanges through CCPs. The role of a Central Counterparty (CCP) is to mitigate counterparty risk. This means that the CCP steps in between the buyer and seller in a transaction, effectively becoming the buyer to every seller and the seller to every buyer. This process reduces the risk that one party will default on their obligations. Therefore, the creditworthiness of the contract or product is not a determining factor for clearing through CCPs, as the CCP itself is designed to manage this risk.

Choice A is incorrect. Standardization of contracts or products is indeed a criterion for clearing through CCPs. Standardized contracts have uniform terms and conditions, which makes them easier to trade and clear in exchanges.

Choice B is incorrect. Less complex contracts or products are preferred for clearing through CCPs as they are easier to understand, value, and manage risk-wise. Complexity can introduce additional risks that may be difficult to quantify or manage effectively.

Choice C is incorrect. Liquidity of the contract or product also plays a crucial role in determining its eligibility for clearing through CCPs. More liquid contracts/products are easier to buy/sell without causing significant price changes, making them more suitable for exchange trading and clearing.