All these conditions tend to increase the probability of a child committing a criminal act, 1 a direct causal relationship has not yet been established.
在这个句子中,本题目选择连词,将前、后两个句子紧密连接。前面小句中,“All these conditions tend to increase the probability of a child committing a criminal act”(所有这一切都会增加儿童犯罪的可能性)提出了句子的大意,而在后面的句子中“a direct causal relationship has not yet been established”,句子成分完整,且出现了非常明显的否定关系的词“not”,“a direct causal relationship has not yet been established”(直接因果关系还不确定),“所有的这些情况都趋向于增加青少年犯罪的可能性,......其中直接的联系还没有建立起来。”不难发现,前、后两个句子之间体现为让步关系。因此,正确选项为C选项(although)。
参考译文:
All these conditions tend to increase the probability of a child committing a criminal act, although a direct causal relationship has not yet been established.