There are more and more crimes ______ a lack of rules and regulations.

选择一项：
A. since
B. because of
C. because

B. because of译文：不断增加的犯罪是由于缺乏监管条例。 解析：这个句子前后是因果关系，because 和since后面跟句子，because of后面跟名词或者名词短语。因此选because of。