Which sentence from the article shows why branches check each other?

A.
“Though each branch of the government has its own leaders, these branches must work together to make a democracy work.”

B.
“Each branch of government must check the actions of the other two branches to prevent one branch from having too much power.”

C.
“The U.S. government has survived for more than 200 years, but it takes more than good leaders for a democracy to last.”

D.
“They can also vote for leaders who represent them in Congress.”