James has a job analyzing page layouts. He often needs to measure the sizes of letters printed on a page. Which of the following units would likely make James's measurements easiest to read?

a.

feet

b.

kilometers

c.

inches

d.

millimeters

The letters printed in the pages, as you may have probably notice are very small and that it would range from 3 mm or a little higher. Therefore, among the choices given, the most reasonable answer would be millimeters. Thus, the answer is letter D.