Ignoring the chaos that began when the bird flew in through the window, our gray-striped tomcat gazed serenely at the scene, moving hardly a whisker and making not a sound.'
Which word or words in the sentence help readers understand that serenely means "calmly" or "peacefully"?

A. the chaos that began
B. flew in through the window
C. gray-striped tomcat
D. moving hardly a whisker