The internal communication linkages are the most important to the health of the project. Which of the following is one of the major diving forces for effective communication in a project

A) Optimization
B) Differentiation
C) Selection
D) Integration

根据《联合国国际货物销售合同公约》，下列表述正确的是（ ）

A．宣告合同无效解除了双方当事人在合同中的义务

B．一方根本违约，另一方只能要求损害赔偿

C．缔约方不得对《公约》声明保留

D．合同当事人不能以寄存方式保全货物