What prompted Darius I to lead a Persian invasion of Greece? Themistocles trapped and destroyed the Persian navy at Salamis.
Dozens of Spartans fought the entire Persian army at Thermopylae.
Persia supported Sparta against Athens in the Peloponnesian Wars.
Athens supported a revolt of Ionian Greeks against the Persian governor.

IT IS C

Explanation:

the answer is b for brother

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 % " .