单项选择题

Many a young person tells me that he wants to be a writer. I always encourage such people, but I explain that there’s a big difference between "being a writer" and writing. In most cases these individuals are dreaming of wealth and fame, not of the long hours at a typewriter, "You’ve got to want to write, "I say to them, "not want to be a writer."
The reality is that writing is typically a lonely, private and low-paying affair. For every writer kissed by fortune there are thousands more whose longing is never rewarded. When I left a 20year career in the US Coast Guard to become a freelance writer (自由撰稿人), I had no prospects at all. What I did have was a friend who was fond of me and so supplied my room in a New York apartment building. It was cold and had no bathroom; I bought a used manual typewriter and felt like a genuine writer.
After a year or so of this existence, however, I still hadn’t gotten a break and began to doubt myself. It was so hard to sell a story that barely made enough for a weeks’ groceries, I felt I was destined to be one of those people who die wondering, "What if" I would keep putting my dream to the test——even though it meant living with uncertainty and fear of failure. This is the "shadow land" of hope; anyone with a dream must learn to live there.

"...people who die wondering, 'What if'" (line2, line 3) refers to those()

A.who think too much of the darker side of life
B.who regret giving up their careers halfway
C.who think of lot without making a decision
D.who are full of imagination even until death