Read the following context and choose the best option to answer the question.
Context: But I always knew when Doug was playing the tympani behind me because it was flawless . I have a memory of Doug playing the rudiments on the snare drum for a music class test . The younger drummers could only wonder at his humble performance as I watched from across the room , mesmerized . At heart , Doug was much more of a set player , a rocker , but his formal technique was amazing .
Question: How can the narrator be so sure that Doug is behind him ?
Options: 
A. The narrator is experienced with Doug 's expert - level of craftsmanship .
B. The narrator can hear Doug 's familiar voice .
C. The narrator can smell Doug 's familiar odor .
D. None of the above choices .


A