A student decides to conduct an investigation to determine the boiling points of water and ethanol. The student will heat samples of water and ethanol and measure the temperature at which the sample boil. The student will conduct the investigation 3 times. Which aspect is missing from the experimental design.

The missing aspect from the experimental design is B. deciding the right equipment.

While the student has outlined the investigation in terms of the number of trials (A), the procedure (C), and what data to collect (D), there is no mention of the specific equipment needed for the experiments, such as boiling flasks, thermometers, heat sources, and any safety equipment. Selecting the right equipment is crucial for conducting the investigation accurately and safely.