A boy asked his mother to buy him a bar of chocolate when they were shopping for groceries. The boy's mother told him he could not have any chocolate because he had been naughty. When the boy's mother turned to continue her shopping. the boy took a candy bar and stuffed it into his pocket. As the boy and his mother were leaving the till with their groceries, a store clerk stopped them and demanded the boy turn out his pockets. The boy did as the clerk asked, and the chocolate was discovered.Which of the following is the minimum age at which the boy could be held criminally responsible for his action in England and Wales?