单选题：The Definition of Success　　There are many ways of defining s

The Definition of Success
　　There are many ways of defining success. Itis accurate to say that each of us has our own concept of success to the extentthat each of us is responsible for setting our own goals and determiningwhether we have met these goals satisfactorily. Because each of us possessesunique differences in genetic ability and favorable environments in which toexpress these abilities, it is necessarily true that we must define successbroadly.
　　For some people, simply being able to live their life with a minimum of miseryand suffering is considered a success. Think of the peace of mind of the poorshepherd who tends his sheep, enjoys his frugal life with his family in the beauty of nature, and who is respected because hedoes a good job of achieving the goals expected of and accepted by him and hissociety. On the other hand, it seems that even though some people appear to berich in material possessions, many of them seem to be miserable and considerthemselves unsuccessful when judged by their own goals of success. Because notall ventures can be successful, one should not set unrealistic goals forachieving success, but if one has self-confidence it would be unfortunate toset one’s goals at too low a level of achievement.
　　A wise counselor(顾问) once saidto a young man who was experiencing frustration with his own professionalsuccess: “You do nothave to set your goal to reach the moon in order to have success in traveling.Sometimes one can be very successful merely by taking a walk in the park, orriding the subway downtown,” The counselor added,“You have not really failed and spoiled your chances for successuntil you have been unsuccessful at something you really like, and to which youhave given your best effort.”
根据以上内容，回答题。
According to the first paragraph, what are essential in achieving success?
A) ability and goals
B) goals and determination
C) ability and environment
D) goals and environment