human
Question: An experiment is being conducted to determine the air quality inside a building. In order to come to a conclusion, scientists must gather data. Which of the following would be an excellent source of data from which to draw a conclusion?

Choices:
A) naked-eye viewing
B) calculations of air mass
C) demonstrations of air pressure
D) measurement of airborne particulates
gpt
The correct answer is 3: measurement of airborne particulates.