Question

rohini is testing how different types of sugar impact blood insulin levels. what kind of investigation is this? comparative investigation experiment none of these descriptive investigation

Explanation:

An experiment involves manipulating a variable (types of sugar) to observe its effect on another variable (blood insulin levels). A comparative investigation would compare pre - existing data or conditions without direct manipulation. A descriptive investigation just records and describes phenomena without manipulation or comparison for cause - effect relationships.

Answer:

B. Experiment