The following information pertains to a defined benefit pension plan that Arora Inc. sponsors in 2020. PBO balance, January 1, 2020 Service cost Interest cost Prior service cost adjustment based on past service, January 1, 2020 Amortization of prior service cost Actuarial gain on PBO Benefits paid to retirees Contributions to plan $160,000 19,000 11,200 30,000 3,000 6,000 2,500 18,000 What is the PBO balance on December 31, 2020? Select one: a. $228,700 b. $216,700 C. $211,700 d. $193,700 X