Under one of the following conditions, goods or services may be procured through competitive negotiation in accordance with this Law: ______.

A．where, qualified tender is lacking，or re-invitation fails
B．where the goods or services in question are special in character and can only be procured from a limited number of suppliers
C．where goods or services can be procured from only one supplier
D．where consistency of the items or compatibility of the services procured requires procurement of additional items or services from the same supplier