company's defined benefit pension plan incurs current service cost of $4 000 000. This pensionplan's assets generated $2 500 000 of income, which exceeded expectations by $500 000. Pension obligations incurred interest cost of $1 500 000, which were $700 000 below expectations. During the yr, company increased benefits in the pension plan & incurred $800 000 for past service cost. What is the pension expense for the yr?

a. $5 600 000 c. $3 800 000

b. $4 600 000 d. $5 000 000