双子叶植物根中凯氏带的位置应为下图中哪一种？ A. <br/> <img src="https://static.zxtiku.com/wangke/imgs/topic/70850d346a0338b40ab3702ba9566a85.jpg"/> B. <br/> <img src="https://static.zxtiku.com/wangke/imgs/topic/d4a47a7104c616dbee1d1ad9d65e068d.jpg"/> C. <br/> <img src="https://static.zxtiku.com/wangke/imgs/topic/3213656b33a2444bdf5b7d6042e27b8e.jpg"/> D. <br/> <img src="https://static.zxtiku.com/wangke/imgs/topic/8b15c0ef75409e0066bcb2d7381669c3.jpg"/>