At any rate,he hit upon a way of making a living,with no competi

At any rate,he hit upon a way of making a living,with no competitors.
A、He was the only person to make a living in such a competitive way.
B、He chose this particular way of living in order to avoid competition.
C、He was free to choose his own way of living without competing with others.
D、He came up with a way of supporting himself and nobody else did the same.
【正确答案】：D