A. In our research, the population density and percentage of infected persons was compared.
Explanation:
Energetic writing is a style of writing that keeps the reader interested in the message the writer has to pass. Energetic writing is not boring. The use of the active voice instead of the passive voice would keep the reader interested.
In the first sentence, the phrase, 'In our research', draws more attention and can be described as more active since it describes the activity or action more vigorously. This is unlike the second phrase, 'Our research' which is boring and not descriptive enough.
