The presidential primary system .

has limited partisanship

is used in almost all states

is determined by state leadership

was used in a few states in 2008

Is determined by state leadership

Explanation:

All primaries are partisan

all states have them

All states had them in 2008

and the state legislature determines the type of primary is used, either open, closed, semi closed, caucus, non cacus etc.

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 % " .