Which headline best illustrates the operation of
 checks and balances?
 (1) “President Andrew Johnson Impeached by the
 House of Representatives”
 (2) “President Dwight Eisenhower Sends Troops to
 Little Rock”
 (3) “President Ronald Reagan Engages in Arms
 Reduction Talks with the Soviets”
 (4) “President George W. Bush’s Approval Ratings
 Drop Due to the Iraq War”