The option that best explains the limits to the power of the executive branch established in the U.S. Constitution is:
"The president is elected for a four-year term, and one person can have only two terms as president."
This reflects the constitutional limitation on the presidency, which is established in the 22nd Amendment, limiting a person to two terms as president. This serves to prevent the concentration of power in the executive branch. The other options do not accurately describe the checks and balances or limitations imposed on the executive branch by the Constitution.