题目内容：
根据以下材料回答：
Which of the following does"labor market problems" (Line 1, Para. 1 ) refer to?
[A] Shortage of jobs providing adequateincome.
[B] Deficiencies in the training of thework force.
[C] Trade relationships among producers ofgoods.
[D] The overall causes of poverty.
参考答案：
答案解析：