Answer: NADH
Explanation: nicontinamide adenine dinucleotide (NAD) carrying two electrons and bonded with a hydrogen (H)
Energetic, looks well nourished, alert, aware of surroundings
Between the 6th and 21st days of the menstrual cycle
The answer is: A. collecting data
During this process , researchers would use their observational skills and record every notable occurrence that happen to the variables.
The focus on this process is simply to add all relevant data without making any analyzation. That process come later on after the researchers started to change the variables in order to see whether it would create a correlation.