Passage 4Questions 16 to 20 are based on the following passage.E

Passage 4
Questions 16 to 20 are based on the following passage.
Everyone can run a half marathon or marathon.
I finished the Eau Claire Half Marathon about three hours prior to writing this,so there's a good chance I could still be feeling the effects of runner's high.But I should say the desire to run is the difference between a“runner'"anda"non-runner."
After the race.I was talking to an onlooker who told me he didn't think just anyone could run a half or full marathon.He was convinced a person's ability to run is dictated by their body type;you're either born a marathoner or out of luck.
Based on my self-collected evidence,this is not true.While running the half marathon,I noticed the diversity of runners around me.There were tall people,short people:thin and wide people.A woman with gray hair who appeared to be several years older than me beat me.For a while,I ran next to a person in a wheelchair,who was part of a non-profit charity called myTEAM TRIUMPH.
Don't get me wrong:completing a half or full marathon is a chaltenge,But I firmly believe that when it comes to crossing the finish line,body type-or age or ability or gender-does not matter.
Something that stuck with me the entire 13.I miles was what the starting line announcer told the crowd-finishing a half or full marathon is more than just a race,it is proof you can do anything you put your mind to.
In retrospect(回想起来)it sounds insincere,but it kept me going during mile eight through eleven of the race.I have a rising suspicion that long distance races aren't a test of physical fitness:They're a test of mental strength.
The same goes for training.Dedicating hours to running (sometimes.in the least-desirable conditions)is much more a battle of determination than a physical one.One of my friends who ran the half marathon consistently trained on a few hours of sleep,thanks to a terrible work schedule.
Running a long-distance race is as simple as making a decision and sticking with it.
In her book“Running Like a Girl,"Alexandra Heminsley recorded everything from her humble beginning to her completion of several marathons and half marathons.“Whenever anyone asked me how I'd done it,"she wrote,"the answer was simple:I decided to be able to.”
What is the author's purpose in mentioning other runners?
A、To inform people of the types of runners.
B、To tell people that determination matters.
C、To describe physical features of the runners.
D、To show that people benefit from marathons.
【正确答案】：B