Given the task definition and input, reply with output. In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".

[header] How to use zipcars [title] Make sure you're eligible. [step] In order to join zipcar, you first need to meet all the eligibility requirements. To be zipcar eligible, you need to be 21 years or older, have a valid driver's license and accept zipcar's terms and conditions. <sep> (A) To qualify, you must be at least 21 years old. However, some cities (like new york and chicago) and central and south dakota allow you to do so, too. (B) Make sure you pass these requirements in order to be eligible for zipcar. [substeps] In the united states, you must be at least 21 years old and have a valid government-issued driver's license. (C) [substeps] If you are 18-20 years old and a student at a college or university, you are also eligible to join zipcar. If you do not have a us or ontario based driver's license, you must complete a " declarations form. (D) Each state has a specific requirements regarding the zipcar registration process, and these requirements vary from state to state. For example, in idaho, you must be 21 years or older.
C