The correct option is D. Web diagram is a file that allow one to visualize, map and modify a work as necessary. To narrow down a research study, web diagram can be used to collect information about the different aspects of the research work and you can then decide on the specific aspect you want to focus on depending on the results you get from your web diagram.
to show the other part or other side like pros and cons there can be the pro of the argument and the cons the cons can show why/when/where the bad parts of the topic/theme is
In the slave societies of the Americas, a quadroon or quarteron was a person with one quarter African and three quarters European ancestry (or in Australia, one quarter aboriginal ancestry).