How do the major parties select their candidates for president of the united states

a. party members select their party’s candidate in a single run-off election.
b. party “bosses”choose their party’s candidate at their party’s nomination convention
c. all registered voters decide which candidates each party should choose in a national primary election
d. after a series of caucuses and primary election, delegates at each party’s nominating convention choose their candidate

In primaries, party members vote in a state election for the candidate they want to represent them in the general election. After the primaries and caucuses, each major party, Democrat and Republican, holds a national convention to select a Presidential nominee.

My deepest apologies if this is not what you meant.

d: their own individual powers within the new goverment

the pogroms became known as kristallnacht, the "night of shattered glass," for the shattered glass from the store windows that littered the streets. the morning after the pogroms 30,000 german jewish men were arrested for the "crime" of being jewish and sent to concentration camps, where hundreds of them perished.