Question

multiple choice
oxygen, hydrogen, carbon, and nitrogen
oxygen, hydrogen, carbon, and copper
oxygen, hydrogen, glucose, and carbon
oxygen, hydrogen, carbon, and sodium

Explanation:

The question is about the main elements in the human body. The primary elements in the human body are oxygen, hydrogen, carbon, and nitrogen (along with others, but among the options, this is the correct set as copper, glucose, and sodium are not primary in the same way as nitrogen here).

Answer:

A. Oxygen, hydrogen, carbon, and nitrogen