Question

complete the text with the best transition. some people argue that bottled water is better than tap water. however, research shows that bottled water is not always safer than tap water. ____________, studies have found that bottled water can sometimes contain microplastics or chemical contaminants due to the packaging process. this means that in some cases, tap water can be just as safe—or even safer—than bottled water for daily consumption. otherwise however in particular on the other hand

Explanation:

"Otherwise" means in different circumstances. "However" is used for contrast but is already used earlier. "On the other hand" is for presenting an alternative view. "In particular" is used to single out something specific. Here, "In particular" is appropriate as it is specifying the findings about bottled - water contaminants.

Answer:

In particular