信托计划的C类是指该信托计划按照投资者的风险承受能力被划分为C类，表示该计划属于中低风险等级。

在信托计划中，投资者可以根据自己的风险承受能力和投资目标选择不同的投资类别。通常，信托计划会根据投资者的风险承受能力分为A、B、C三类，其中A类为高风险、高收益，B类为中高风险、中高收益，而C类则为中低风险、中低收益。

对于C类投资者而言，他们通常更注重本金的安全性和稳定的收益，而不是追求高风险和高回报。因此，信托计划的C类通常会选择相对稳健的投资策略和项目，以确保投资者能够获得相对稳定的收益，并降低投资风险。

相比其他投资方式，信托计划C类具有较高的安全性和相对稳定的收益。同时，信托公司通常会对投资者进行风险评估和风险提示，以确保投资者了解投资风险并做出明智的投资决策。

需要注意的是，任何投资都存在风险，即使是属于中低风险的信托计划C类也不例外。投资者应该根据自己的财务状况、投资目标和风险承受能力选择适合自己的投资方式，并仔细阅读相关合同和资料，了解投资的具体细节和风险。

In summary, the C class of a trust plan refers to the classification of the plan as being of low to moderate risk based on the investor's risk tolerance. Investors can choose different investment categories based on their risk tolerance and investment goals. Trust plans typically divide investors into three categories: A, B, and C, with A being high risk and high return, B being moderate to high risk and moderate to high return, and C being low to moderate risk and low to moderate return. For C-class investors, they typically prioritize the safety of their principal and stable income over chasing high risks and high returns. Therefore, trust plans in the C class typically adopt relatively conservative investment strategies and projects to ensure investors receive stable income while reducing investment risks. Compared to other investment options, trust plans in the C class offer higher security and relatively stable income. Additionally, trust companies typically conduct risk assessments and provide risk warnings to investors to ensure they understand the investment risks and make informed decisions. It is important to note that any investment carries some level of risk, even those in the C class of trust plans. Investors should choose investment options that suit their financial situation, investment goals, and risk tolerance. They should also carefully read relevant contracts and materials to understand the specific details and risks of the investment.