The correct answer is The growing influence of other European powers decreased British strength.
With the expulsion of the French from India in 1763 (Treaty of Paris, at the end of the Seven Years' War) and the possession of their colonies in America (Canada, Mississippi, some Antilles), the English were superior to France and Spain. His only setback in this period, which was strong, in fact, would be American independence in 1776. This loss will be compensated with the beginning of the colonization of Australia (1783) and later New Zealand (1840), where he initially sent deportees. Its armada remains superior to the others with the Battle of Trafalgar in 1805, once again imposing a heavy defeat on an opponent. The dominance of new colonies is constant at this time - Malacca, since 1795, Ceylon, Trinity, in 1802, and Tobago, Malta, Saint Lucia and Mauritius, in 1815, after the Napoleonic defeat and its continental blockade. Singapore was founded by Thomas Raffles in 1819. In Canada, the advance to the west is registered, opening new fronts of colonization, the same happening in India, with the exploration of the interior of the Decão and Assam, Bengal, etc.
The 19th century marks the height of the British Colonial Empire, whose economic and human expansion is favored by the development of financial and industrial capitalism, as well as by high demographic pressure. On the other hand, it marks a new administration and management of the colonial reality. An example of this is the direct government of the Crown in India.