The correct answer is the following: option D. The best way to show people the type of problems pollution in the Thames has caused over the years would be to describe the specific diseases that have been caused by the Thames River pollution. An effective way to bring conscience to people about the danger of the River Thames pollution could be by describing the different diseases that can affect humans and animals that live nearby the river due to its pollution levels. By doing so, the audience would probably become more engaged with the topic, as they would want to avoid getting any health issue as a consequence of being in contact with polluted water.