Read the following context and choose the best option to answer the question.
Context: Earlier today I tried a simple form for 10 minutes : sit straight up , close your eyes , and pay close attention to every breath . The first couple of minutes felt like an eternity ; I was n't sure I would last for ten . It felt like my heart was beating too fast or too hard ; it was pretty uncomfortable .
Question: Why was the narrator focusing on their breath ?
Options: 
A. They were afraid .
B. They were running for their life .
C. None of the above choices .
D. They were getting a routine in .


D