Incurable and curable short and long lived items??

I thought i was sorted with this topic but i have seen two questons on “Incurable and curable short and long lived”…and this has thrown me off a bit.

For example:

Q

Suppose the total reproduction cost of the building is $750,000, its effective age is 5 years, its total economic life is 30 years, the reproduction cost of short-lived curable items is $50,000, and the reproduction cost of the short-lived incurable items is $100,000. What is the total long-lived physical deterioration for this building?

A. 100,000. B. 125,000. C. 25,000.

Whats your take??