【单选题】
A select id,name.manager_id from employees
B select id,name,manager_name from employees
C select e1.id.e1.name,e2.name from employees e1 join employees e2 on e1.id = e2.id
D select e1.id.e1.name,e2.name from employees e1 join employees e2 on e1. manager_id = e2.id
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