Dr. fernandez was interested in the effects of caffeine on reaction time. after administering various doses of caffeine to different participants, she tested participants’ reaction times. this is an example of research.

experimental

Explanation:

According to my research on different research methodology, I can say that based on the information provided within the question this is an example of experimental research. This refers to a research approach where you do not know what the results will be so the researcher creates a series of controlled tests in order to gather data and come to a certain conclusion.

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i think the correct answer is b) humans who reduce their calorie intake by at least 25 percent on a long-term basis will live longer than they would have they not done so. i hope i you out