题目内容：
Which of the following led to Kemmons' success according to the passage?
A．Self-confidence, had work, higher education and a poor family. B．Mom's encouragement, clear goals, self-confidence and hard work.
C．Clear goals, Mom's encouragement, a poor family and higher education.
D．Mom's encouragement, a poor family, higher education and opportunities.
参考答案：
答案解析：