答案：A

B、C有较大干扰性。根据上文“buy an expensive camera”，可以得知服务员在此让“我”从several models 中选一款。to choose from在此意为to choose one from several models。本句中to choose from 似乎没有逻辑主句，然而本句相当于We have several models for you to choose from。