单选题：阅读下面短文，回答题： A　　It’s 5:00 in the morning when the alarm (闹钟)

阅读下面短文，回答题： A　　It’s 5:00 in the morning when the alarm (闹钟) rings in my ears. I roll out of bed and walk blindly through the dark into the bathroom. I turn on the light and put on my glasses. The house is still as I walk downstairs while my husband and three kids sleep peacefully. Usually I go for a long run, but today I choose my favorite exercise DVD insanity. Sweat pours down my face and into my eyes. My heart races as I face my body to finish each movement. As I near the end of the exercise ,I feel extremely tired, but a smile is of my face. It’s a smile because the DVD is over , but a smile of success from pushing my body to its extreme limit.
　　Some people enjoy shopping, smoking , food, work, or even chocolate. But I need exercise to get through each day. Some shake heads when they see me run through the town. Others get hurt when I refuse to try just one bite of their grandmother’s chocolate cake. They raise their eyebrows, surprised by my “no thank you,” or by my choice to have a salad. Over the years , I have learned it’s okay to just say “no.” I shouldn’t feel sorry for refusing food that I don’t want to eat.
　　So what drives me to roll out of bed at 5:00 a.m.?What gives me the reason to just say to ice cream? Commtment. A commitment to change my life with a way that reduces daliy anxiety ,increases self –contidence and energy,extends life and and above all improce my body shape.This is the point where a smile appears on my face as I look at myself in the mirror or try on my favorite pair of jeans that now fit just right.It’s through commitmeng and swent that I can make a difference within myself inside and out.Why is there a smile on the author’s face in the morning? A．Because she sees her family sleeping peacefull
B．Because she finishes her favorite exercis
C．Because she enjoys the interesting DVD
D．Because she feels a sense of achievemen