Answer: The word that should be capitalized to correct the sentence is "representatives".
Explanation: One of the rules of capitalization states that the initial letters of the words that refer to governments or government bodies should be capitalized. In that way, as the House of Representatives is part of those bodies, the first letter of "House" and also the first one of "Representatives", that is to say "H" and "R", must be capitalized in order for the sentence to be written in a correct way.
