单选题 What explanation is given for many criminals being kept on death row?

A、 Americans don't trust their oversized government to use their power to keep the traditions
B、 Courts are often required to re-examine cases in case there has been a miscarriage of justice
C、 Groups who want to stop the death penalty often cause delays in its execution
D、 Many murderers don't die young

【正确答案】 B

【答案解析】文章倒数第三段中提到“but in the maze of legal-appeals procedures”，可见涉及死刑案件的当事人往往要上诉，让法院重审案件，B正确；A、C、D均对文章意思存在曲解。