患儿9岁，<img src="/Image1/63/6321b3d23b5a93050427846e1039bb6a.jpg" />近远中深龋洞，牙龈红肿，有一个0.5mm×0.5mm脓肿，扪诊有波动感，X线显示<img src="/Image1/63/6321b3d23b5a93050427846e1039bb6a.jpg" />根分歧及近中根尖区大面积透影，<img src="/Image1/df/df3d88961fabec6349c88d65b25cea3b.jpg" />根形成2／3，上方骨板消失，<img src="/Image1/c0/c04420e15cc63bd17aa1cd0a434e663b.jpg" />萌出2／3 此牙初诊治疗方法为（）<br>A:局麻下拔除<br>B:局麻下脓肿切开<br>C:开髓、拔髓、CP开放，脓肿切开<br>D:开髓CP开放，脓肿切开<br>E:口服消炎药物