The main______ advantage of the firm is the relatively low cost of the labour force both for production and design.

A．particularly if the property is new
B．whatever the age of the property
C．because of rising building cost
D．only if the property is old

A．it is impossible to change that company later on
B．the Society will provide a list of alternative companies
C．the Society will not accept responsibility for the policy
D．the Society may not be able to agree to the company