How many metres high is London's The Shard building?

The correct height of The Shard in London is actually 309.6 meters, which is approximately 310 meters. This height makes it the tallest building in the United Kingdom. The figure of 306 meters is close, but it slightly underestimates the official height of the building.

In this context, although the chosen answer is not entirely accurate, it is the closest approximation compared to the other options provided. The options of 400 meters and 350 meters are significantly higher than the actual height, while 280 meters is too low. Therefore, 306 meters is a reasonable choice among the available options, even if it doesn’t exactly match the official measurement.