[Cycle Challenge instance has been selected, the final result will be confirmed before the challenge starts, please choose the entering unit]
Although the announcement mentioned the option to "choose" an instance, the actual options provided were not many.
Moreover, it's more like choosing a preference, sorting through the available instance choices, and confirming the instance before officially starting the Cycle Challenge.
Seeing this selection mechanism also solved one of Bai Yi's doubts.
After all, the number of Lords ultimately participating is definitely limited, and Lords like her with a paper strength of Tier 4 are even more scarce.
If Lords were really allowed to choose freely, it would definitely not achieve the fairness mentioned in the announcement, ensuring that each instance had an average and diverse regional strength of Lords.