The answer is B, because it is the only answer that is visual (meaning you see it). You have to SEE a map, you don't have to SEE any of the other answers to get the information.
Visuals are those elements that are often added in a presentation in order to highlight or provide more information regarding a particular topic in a very accurate way.
A map is an example of visual that provides the information such as the temperature, pressure, elevation, amount of precipitation in a particular area.
Thus, a map showing the temperature s in different states across a country can be used as a visual in a presentation to explain the effect of climate change.
