How often are all seats in the House of Representatives up for re-election?

All seats in the House of Representatives are up for re-election every two years. This structure is designed to ensure that representatives remain accountable to their constituents and can respond to changing public needs and sentiments. The two-year term length encourages representatives to stay engaged with voters, as they are regularly required to seek re-election. This cycle of frequent elections can lead to greater governmental responsiveness and dynamic shifts in political power based on public opinion.

The other choices reflect different electoral cycles: representatives are not elected annually or every four years, which would not align with the intent of regular accountability. Elections occurring every six years typically refer to the U.S. Senate, where Senators serve longer terms, but this does not apply to the House. Thus, the option of every two years is distinctly accurate regarding the electoral cycle for all House members.