Answer
$B$ ($72\text{ in}$) is the deep end because it is deeper than $A$ ($43.31\text{ in}$)
Work Step by Step
Let’s compare the depths by converting both measurements to the same unit—meters.
End $A$:
$1.1$ meters
End $B$:
$72\text{ in}\times 0.0254\text{ m/in}=1.8288\text{ m}$
End $B$ is deeper — it's approximately $1.83$ meters, while End $A$ is $1.1$ meters.