interesting, i think it could be either historical cost or consistency:
(I)Consistency:
(D)Accounting methods should be applied in a consistent manner to ensure that reports are comparable between periods.
(L)As the non-current assets were previously valued at their historical cost, only this value may be applied so as to maintain consistent records.
I've actually always sucked at linking, so anyone feel free to correct me.
Also a good exercise for these theory q's is to see if you can answer them with a Qualitative characteristic instead of principle (you'll find many of them link)
Try it in this case, see if you can tell me which qualitative char would apply to this question
