When did Malta gain increased significance for the British, and for what reason?

The choice regarding the year 1869/1875 highlights a pivotal moment in history for Malta and its significance to the British Empire, primarily due to the opening of the Suez Canal. This monumental event transformed maritime trade patterns by providing a more direct route between Europe and Asia, significantly reducing travel time for naval and commercial vessels.

As a strategic point in the Mediterranean Sea, Malta became essential for Britain as it served as a key logistical and resupply base for ships traveling to and from the Suez Canal. This not only increased Malta's military importance but also its economic and commercial value, as it allowed the British to maintain a stronger presence in their colonial interests in Asia and the Indian Ocean. The control and utilization of Malta during this period thus became integral to British naval strategy and trade routes.

In contrast, while other historical events mentioned in the other choices had their own significance, they did not lead to an increased strategic importance for Malta comparable to the implications of the Suez Canal opening.