You will be given a definition of a task first, then some input of the task.
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 choose a gps receiver for recreational purposes [title] Determine what you will be using the gps receiver for. [step] Believe it or not, gps units are designed for a variety of uses, and the feature-set of each unit caters to different usage patterns. Some possible uses are : [substeps] Vehicle navigation-driving on the road off-road activities-hiking, hunting, skiing, etc. <sep> (A) Water activities-boating, fishing, etc. Aviation-flying a plane geocaching-navigating to waypoints for fun treasure-hunting [title] Decide on the form-factor of your gps receiver. (B) General sports-camping, outdoor ballet, running, etc. Mystery sites-to keep these devices from being used for camping or other recreational hobbies is very relevant. (C) Car-playing a recording of a vehicle (finding someone on google maps) or an online video-watching it. The added indicator will usually light up within a specific time frame. (D) Level room transmitter-this unit provides communicating, monitoring media and identifying the location at which. Watches are useful or more convenient in this equipment device.
Output:
A