Trench warfare had been used throughout history, but it is most commonly associated with fighting in World War I.
Trenches were as deep as 12 feet and often constructed in
a zigzag pattern. By the end of 1914, an estimated 475
miles of trenches had been dug on the Western Front.
Which statement best represents the main idea of this source?
O
A. Fighting in trenches was dangerous and boring,
B. Trench warfare was used a lot in World War I
O
C. Trenches were often dug to a depth of 12 feet.
O
D. An estimated 475 miles of trenches were built.
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is it multiple choice

the correct answer is:   "   3.6 % " .

          →   the unemployment rate is:   " 3.6 % " .

explanation:

to calculate the "unemployment rate" :

the "unemployment rate"   =

  [# of people unemployed] /   [working age population]   * 100 %   ;

                =   [9 million] / [250 million]     *   100 % ;

    →     note:   the units of "million" cancel out;

                    since:   " {million} / {million} = 1 " ;

                =   (9 / 250)   * 100 %   ;

                = 0.036 * 100 % ;

                =   3.6 %

answer:   the unemployment rate is:   " 3.6 % " .