If ∠DOC = ∠ABC and ∠ABC = ∠DOE, and if DO and CO are the bisectors of ∠ADC and ∠BCD respectively, what is the relationship between ∠ADC and ∠BCD?
a. ∠ADC = ∠BCD
b. ∠ADC > ∠BCD
c. ∠ADC < ∠BCD
d. Cannot be determined from the given information.