A Nurse Who Feels Frustrated About a Colleague's Refusal to Double-Check

A nurse who feels frustrated about a colleague's refusal to double-check a morphine dose he has calculated is demonstrating self-regulation when he:

A) Takes a deep breath, acknowledges to himself that he doesn't know why she can't help, and seeks help from another colleague
B) Decides he won't cover for his colleague's meal break later
C) In a sarcastic voice states, "Thanks a lot!"
D) Decides to save time and give what he believes is the correct dose