Question 204287
The key word here is <b><u>metric</u></b> which means that they're talking about millimeters, centimeters, meters, kilometers, etc...Inches are NOT part of the metric system (they're actually part of the <a href="http://en.wikipedia.org/wiki/English_units">English system</a>)



So how long do you think the average key is? Just think of a meter stick and try to visualize the key right next to it. Would a millimeter be best used? A centimeter? A meter (ie the whole stick)? Or something else?