You are running a project for a customer based on a cost reimbursable contract with the following terms：Target costs，$1000000；fix fee，100000；benefit/cost sharing，80/20；price ceiling，1200000．Which is the PTA (point of total assumption，break point)of the project ？（）
A．$1300000．
B．$1500000．
C．$80000．
D．$1125000．
