PTSD or Post Traumatic Stress Disorder. This is the latest euphemism according to him, we start at WWI with shell shock--->battle fatigue---->operational exhaustion---->PTSD Post traumatic stress disorder
A, it's not it because you need a comma after chores.
B :)
C, No need for a comma after once.
D, no commas needed in between our chores.
Therefore your answer is <u>B</u>
