Which of the following statements about carbon monoxide is true?

Carbon monoxide is indeed a colourless and odourless gas, which makes it particularly dangerous because it cannot be easily detected without specialized equipment. The lack of color and odor means that people may not realize they are being exposed to it until they experience symptoms of poisoning. This characteristic emphasizes the importance of using carbon monoxide detectors in homes and workplaces to ensure safety.

The other options present inaccuracies regarding the properties of carbon monoxide: it does not have a sweet taste, it is not always visible, and it cannot be detected by smell. These misconceptions can lead to dangerous situations, reinforcing the need for awareness and proper safety measures regarding carbon monoxide exposure.