________ choose to live in or near metropolitan areas simply because they like the rapid pace of city life.
句意： 许多人选择住在或临近大城市， 仅仅是因为他们喜欢城市的快节奏生活。 because引导原因状语从句， 主句中有谓语choose， 缺少主语， 故正确答案为A。