l4
=INDEX(B5:F5,MATCH(MAX(B4:F4),B4:F4,0))
M4
=INDEX(G5:K5,MATCH(MAX(G4:K4),G4:K4,0))
BUT
what happens if you get 2 or more answers with the same count ?
what version of excel are you using
if 365 or 2021 - with the filter and texjoin functions
then
=TEXTJOIN(" / ",,FILTER(B5:F5,B4:F4=MAX(B4:F4)))
see P4 and Q4