The Concept of the "Right to Cooperation" Includes That

The concept of the "right to cooperation" includes that:

A) where one party's required cooperation is not timely, the other party is excused from any resulting delay in her own performance.
B) where one party's required cooperation is untimely, the other party is required to tender performance as if the first party had tendered in a timely manner.
C) where neither party is at fault and the agreed manner of delivery becomes impracticable, both parties are required to negotiate a new price.
D) None of these.