Help me with a, b,c, d of the question

Iwill be giving 15 points to whoever answers the concept of checks and balances means that each branch of governmenta. has its own powers and responsibilitiesb. is clearly described in articles of the constitutionc. has the ability to correct the other branches in case of an errord. is set up so that in case of constitutional crisis, the governement will continue to operate

The articles of confederation allowed congress to: make and borrow money. declare war. create a postal service. all of these choices are correct.

Which industries produced great profits and wealth in the late 1800s