The parole board denied Whites parole becauseA．he wrote threatening letters while he was i

The parole board denied Whites parole because

A．he wrote threatening letters while he was in jail.

B．he was sentenced two life sentences for his crimes.

C．the Hall family held a campaign to keep him in prison.

D．they believe that his release will be a threat to the society.

请帮忙给出正确答案和分析，谢谢！