Tariff negotiations

What will the following code print out?

<?php

$tariff = array(
        1 => 1,
        0.9 => "almost one",
        "1" => "one",
        1.5 => "that will do"
);

echo tariff[1];

?>

A: "1"
B: "almost one"
C: "one"
D: "that will do"

Answer