Read the following context and choose the best option to answer the question.
Context: Then the pain kicks in , usually on one side of my head in my temple . My migraines almost always occur during a period of relaxation immediately after a period of high stress . Normally they 're somewhere between 6 and 18 hours of excruciating pain , followed by a day of feeling like I ' ve been hit by a bus .
Question: What may be the reason why their body experiences migraines after stress ?
Options: 
A. Because their body is so tense .
B. Because they had a traumatic childhood .
C. Because they did n't take their preventative medicine .
D. None of the above choices .


A