This is part of Slaughterhouse Five
What does Billy uncontrollably do that requires him to take a nap every day? Why?

Select one:
a. Billy shakes uncontrollably because he is lonely without a significant other for support.
b. Billy shakes uncontrollably because he is sensitive and traumatized by Weary’s words.
c. Billy cries uncontrollably because he likely has PTSD (post-traumatic stress disorder).
d. Billy cries uncontrollably because he misses war and the good times he spent there.