D). To show points of interest where visitors can go.
Explanation:
A road map is primarily employed as a communication/navigation tool that displays the links between the roads and transport.
As per the question, a state tourism office would use a road map in its brochures 'to show points of interest where visitors can go' as it would assist in promoting the tourism(by providing information about the links that would assist the visitors to navigate more conveniently) at a particular geographical location. Thus, <u>option D</u> is the correct answer.
I believe the correct answer is A. Photosynthetic organisms, because they remove certain amounts of CO2 in the atmosphere to carry out the process of photosynthesis. Unlike the other options that increase CO2.