Answer:
All of the arrows pointing up that have a red box NOT the arrow pointing down with a red box. (if the blue squigglies on the water are arrows then they count too, the picture is not too clear)
Explanation:
I would say D. because you round to the nearest whole number and 0.04 is way less than 0.5 which is a good rounding up number.
The experimenting stage, since the scientist would need to record his or her data on a chart