Which of the following statements is not true? __________以下哪个语句是不正确的？ __________
选项：

A:It is quite common that requirements always change, which makes big trouble for development organization.;
B:Users always welcome the completed software system.;
C:Sometimes, the clients do not know what they really need.;
D:Some good software organizations can forecast the requirements of the potential users, so they can lead clients and users.