What is a cause and effect relationship that takes place in the Article?
A. Margaret Pisacano, who has been diagnosed with an anxiety disorder, does not know when a panic attack is about to strike because the symptoms are so mild.
B. Dr. Elena Mikalsen, from the Children's Hospital of San Antonio, says anxiety disorder has become an epidemic because of how it spreads from one teen to another.
C. Because a mental health professional has taught her coping skills, Alexandra West is now free of all forms of anxiety.
D. Because her anxiety disorder made her too afraid to fly, Claire Taylor declined to go on a trip to Spain with friends.