According to the passage, the function of the office manager is to ______A．provide necessa

According to the passage, the function of the office manager is to ______

A．provide necessary information for the local authority

B．keep a balance between production, marketing and administration

C．assist management in making appropriate decisions quickly

D．make sure that administrative work is performed efficiently

请帮忙给出正确答案和分析，谢谢！