Q: In this task, you're given four sentences of a story written in natural language. The given story is not complete and your job is to complete the story by selecting one of the sentence choices from (A) and (B), such that the story sounds fully coherent.
Sentence1: I decided to add a new fountain pen to my collection. Sentence2: I'd seen online videos of a nice pen called a Pelikan M800. Sentence3: So I went to the pen shop at my local mall. Sentence4: The shop had just the model of pen I wanted. 
 (A) I bought the pen. (B) I didn't buy the pen.
A:
A