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C is corrent. Weighted-average rates disclosed for defined benefit pension plans include (1) the discount rate used to determine the benefit obligation, (2) the expected rate of return on plan assets, and (3) the expected rate of compensation increase.
A is incorrect. Weighted-average rates disclosed for defined benefit pension plans include (1) the discount rate used to determine the benefit obligation, (2) the expected rate of return on plan assets, and (3) the expected rate of compensation increase. 
B is incorrect. Weighted-average rates disclosed for defined benefit pension plans include (1) the discount rate used to determine the benefit obligation, (2) the expected rate of return on plan assets, and (3) the expected rate of compensation increase. 
C is incorrect. Weighted-average rates disclosed for defined benefit pension plans include (1) the discount rate used to determine the benefit obligation, (2) the expected rate of return on plan assets, and (3) the expected rate of compensation increase.