What kind of check on power does Montesquieu describe in this excerpt?

To prevent this abuse [of power], it is necessary from the very nature of
things that power should be a check to power. A government may be so
constituted, as no man shall be compelled to do things to which the law
does not oblige him, nor forced to abstain from things which the law
permits When the legislative and executive powers are united in the
same person, or in the same body of magistrates, there can be no liberty.
. Again there is no liberty if the judiciary power be not separated.

Explanation is in the file

cutt.ly/zxt1ipy

overtime, the civil rights movement changed in a way that not only it benefited african-americans, but benefited other ethnicity's such as latinos, asians, or women too! that's why the results of the movement be called mixed.

the civil rights movement brought about tremendous changes. no longer were blacks denied the right to vote, to eat, shop, and swim where they , and more importantly, to attend integrated schools. despite its many accomplishments, however, the civil rights movement had its shortcomings. for example, many people, both young and old, lost their lives, homes, jobs, and families. still other individuals were so damaged by psychological trauma that they ceased being productive members of the community. the movement left intact the economic inequities that had contributed to the maintenance of segregation. and finally, racism remained alive and well long after the movement's end. like most movements of its kind, the civil rights movement left behind a mixed legacy of triumph and tragedy.

i believe it d) heterogeneous