【单选题】

When I was in my twenties, I drove for a taxi company inDayton, Ohio, making a small hourly wage. It was the summer of 1966.

One afternoon I was sitting at a downtown taxi stand, hoping to get an airport run. Instead, I got a call from the manager, who told me to go to a newsstand and buy a racing form. Then I was to stop and pick up a six-pack of beer, some goldfish food and a box of cigars. He directed me to deliver the goods to an address in a nearby neighborhooD、
I protested, not wanting to lay out money from my own cash supply, because I was afraid I might not be able to collect the money.
The manager told me this man was a regular customer. He assured me that there would be no problem with payment, and said I should get moving or bring the car back in. Since he put it that way, I got moving.
The building smelled of tobacco smoke. I knocked on the door and could hear something moving across the floor.
Finally the door opened, and there was a disabled man sitting on a small wood platform, looking up me.
The man was polite and very grateful for my services. When I set the racing form down on the coffee table, I noticed an open velvet case that looked like a jewelry box.As the man rolled over and reached for some money to pay me, I glanced inside. There was a medal: a Purple Heart from World War 2.
Guilt began to creep over me as he paid and gave me a generous tip. The man was a quiet sort of person, obviously not in need of companionship.
He had long ago yielded to his condition and to the sacrifice he had made. I made that run many more times in my taxi until I moved on to another job, but I never learned his name and we never became friends despite our regular contact.
Unfortunately for me, I would be more than twice the age I was back then before I learned that prejudging people makes you wrong about most things most of the time.
What do we know about the writer after reading this passage
A、He always obeyed his boss.
B、He liked to prejudge other people.
C、He wanted to make friends with the man.
D、He would like to show his respect to heroes.