That's because $sthB_A is undefined. The do() method will take a prepared statement, though.
my $sthB_A = $dbh->prepare($Command_B);
my $count = 1;
foreach (@CHOICE_B[1 .. $elements_in_array_B]){
$sthB_A->bind_param($count, $_);
$count++;
}
my $result = $dbh->do($sthB_A) or die "Couldn't do query: ".$dbh->err
+str;
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