功能服务是心理服务的（）。

A.前提

B.保障

C.基础

D.动力

After a gastrectomy, the client will have a nasogastric tube in place for several days postoperatively. The nurse explains to the client that the nasogastric tube is for which of the following reasons

A. Prevent excessive pressure on suture lines.
B. Prevent the development of ascites.
C. Provide enteral feedings in the immediate postoperative period.
D. Enable administration of antacids to promote healing of the anastomosis.