A consumer is willing to pay $\textbackslash$ 12$ for a good, but is able to purchase it for $\textbackslash$ 10$. What is the consumer surplus in this scenario? 
选项为:A:$\textbackslash$ 2$  B:$\textbackslash$ 10$  C:$\textbackslash$ 12$  D:$\textbackslash$ 22$  请回答其中一个选项.