The correct answer is B) A constitutional monarchy with elected officials holding most political power.
<em>The phrase that best describes the British government during the 19th century is a constitutional monarchy with elected officials holding most political power.</em>
In that period of Great Britain, the power of the monarchy was limited by the Parliament. The Parliament were representatives of the people and it represented a balance of power in England. Having lived those dark episodes in the history of English monarchs in the past, and after the Magna Carta, a constitutional monarchy with elected officials holding most political power was the best option of government for England.