To provide the best response based on the data shown in the graph, I would need to see the actual graph you're referring to in order to analyze the information accurately. However, I can help deduce the correct option if you can share the key findings or percentages presented in the graph regarding the composition of the human body.
Based on general scientific knowledge:
- Option a: While potassium is important, carbon is more significant in terms of human composition, but it is not the most abundant element.
- Option b: Oxygen makes up a large part of the human body (about 65% by mass).
- Option c: This is true; humans are indeed composed primarily of water (about 60% of the human body).
- Option d: Calcium comprises about 1-2% of the body by mass.
If you can provide more details from the graph, I could help you select the best response more effectively! Otherwise, based on general knowledge, option c (humans are composed primarily of water) is typically considered the most accurate.