CGU Question(Similar scenario to lecture video, but contradicts with BPP answer)

A cash generating unit comprises the following assets:

$ 000
Building 700
Plant and equipment 200
Goodwill 90
Current assets 20
____
1010
One of the machine carried at $40000 is damaged and will have to be scrapped. The recoverable amount of the cash generating unit is estimated at $ 750000.

What will be the carrying amount of the building when the impairement loss has been recognized?
A)$597000
B)$577000
C)$594000
D)$548000

In your lecture video, I understand your reasoning for not further impairing P+E after removing the destroyed P+E. But in this question, BPP also includes the remaining P+E in the pro-rata impairment calculation along with Building, giving answer C. While following your method I got $570000.

Can you please assist? Not sure if I may have gotten confused somewhere along.
Thanks