The question refers to case estimates to incurred claims. What's the definition of incurred here? One of the bullet points in the answers say - an acceleration in the rate at which outstanding claims are established. Looking at this it sounds like incurred does not include outstanding.
Although the Glossary gives you two definitions for incurred claims, they both include outstanding claims. In this question, you should use the non-annual accounting definition, ie paid claims plus outstanding claims, bearing in mind that case estimates are just a type of outstanding claim (referring to the way they have been established). If the rate at which outstanding claims are established increases then the case estimate to incurred claims ratio will increase, all other factors being equal, as the case estimates will be a bigger proportion of the incurred claims.
