The fastest route here is to match each case to the specific stage of custody it addresses, and see which stage Section 41-B itself covers.
The correct answer is D.K.Basu v. State of West Bengal.
Another way to confirm this is to look at how Parliament actually responded to D.K. Basu's guidelines through the 2008 CrPC amendment.
Tracing the legislative history of the 2008 amendment confirms D.K. Basu as the case behind Section 41-B.
Hence, the correct answer is D.K.Basu v. State of West Bengal.