The debug statement you suggested output some references like :
ARRAY(0x94b3910)
But when i try what Eliya suggested :
my $B = $doc->selectNodes("A/B")->[$cpt]->nodeValue();
my $D = $doc->selectNodes("A/C/D")->[$cpt]->nodeValue();
print "$B / $D \n";
I get : Use of uninitialized value $B in concatenation (.) or string at line xxx and the same for $A for each iteration of the loop
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