What prediction can a reader make when a phrase such as tortoise and turtle is used several times in a passage's first lines?
a) tortoises and turtles are enemies.
b) tortoises and turtles are the topic.
c) tortoises and turtles are best friends.
d) tortoises and turtles are important reptiles.

c) troops march forward in close formation against newer, more accurate weapons

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 % " .