How to have more than 10 answer choices for a survey question in CRM?
The UI restricts the number of answers-per-question to 10. If more than 10 picklist values are needed, data load the values to Answer_Choice_vod__c.
Keep in mind, that the increasing number of picklist values can cause performance issues. Therefore, try to limit the number of picklist values as much as possible.
CRM Help Documentation: Data Loading Surveys