An examination question on memory computing

if 256k*8bit memory chips are used to form memory areas from 4000 0000H to 400F FFFFH and addressed by bytes, () chips are required.

(A). 4
(B). 8
(C). 16
(D). 32

ask for advice, how to calculate it?

Mar.12,2021

4000 0000H to 400F FFFFH total 2 ^ 20 = 1m bytes
1M/256K=4
it has been so long since I finished the exam that I forgot how to do such a simple question

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