单项选择题
Current service cost for a defined benefit pension plan amounted to 
7,500,000, while actual income was 9,000,000, which matched the actuarial estimates. No past service costs arose during the year. Given this information the pension expense for the year was: ()
A．$500,000
B．$2,200,000
C．$2,500,000
D．$1,000,000
B．$2,200,000
C．$2,500,000
D．$1,000,000