题目8单选题
某项目中有两个活动单元:活动一和活动二,其中活动一开始后活动二才能开始. 能正确表示这两个活动之间依赖关系的前导图是 ( )A. <img src="https://tihai-oss-cloud.itihey.com/img/d38dc482c13a2f7ebf80b1b88931c752.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/7bce9a98ca4513e70ec4dce0b67ade1a.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/d261c3027ddf0ee21811f483b411f04b.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/381da4c1437198d4b5319e2f11e93d76.png">