在以下哪种情况下，关键路径上的活动可能出现负的浮动时间？（）

A.用顺推法所得到的完工日期晚于客户所要求的完工日期

B.用逆推法所得到的完工日期晚于客户所要求的完工日期

C.用顺推法所得到的完工日期早于客户所要求的完工日期

D.用逆推法所得到的完工日期早于客户所要求的完工日期

The client with a total laryngectomy receives tube feedings to meet his fluid and nutrition needs. The nurse explains to the client that the purpose of the tube feedings is to

A．prevent pain from swallowing.

B．prevent fistula development.

C．ensure adequate intake.

D．allow for adequate suture line healing.