Which of the following is an example of a jim crow law? a. "all marriages between a white person and a negro, or between a white person and a person of negro descent to the fourth generation inclusive, are hereby forever prohibited." source: b. "[there shall be] open, competitive examinations for testing the fitness of applicants for the public service now classified or to be classified here-under." source: c. "after one year from the ratification of this article the manufacture, sale, or transportation of intoxicating liquors . . is hereby prohibited." source: d. "the right of citizens of the united states to vote shall not be denied or abridged by the united states or by any state on account of race, color, or previous condition of servitude." source: