59.Information concerning Mustang Company's defined benefit pension plan follows: $180,000 110,000 60,000 150,000 Prior service cost incurred this year Contribution to pension plan Service cost Benefits paid to retirees Beginning plan assets Actual return on plan assets Beginning PBO interest cost 640,000 150,000 900,000 80,000 100,000 9,000 Expected return on plan assets Amortization of prior service cost concerning What is the ending balance of PBO ? A. $1,070,000 B. $970,000 C. $899,000 D. 960,000