Instructions: 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".
Input: [header] How to call cuba from canada [title] Dial 011 when you hear the dial tone. [step] The exit code for canada is 011 and needs to be typed in every time you want to make an international call. This lets the phone company know where the incoming call is coming from. <sep> (A) [title] Enter 53 for cuba's country code. [step] Almost every country has a unique 1 or 2 digit code so you're able to connect. (B) [title] Place your phone on the countertop in a safe place. [step] The room should be positioned above ground, or near an open window. (C) [substeps] If you're receiving a call from your country of origin-such as north korea or west korea-then you will be prompted to dial your country's code. [title] Dial 011 up to type exit code. (D) You can exit the exit code and dial 011 while you are traveling. [substeps] Dial 011 when the call sounds outside of india, not if you hear it inside of india.
Output:
A