Question

but are bamboo toothbrushes really the most sustainable option? contrary to popular belief, the answer might be no. according to a recent study that analyzed the lifecycle of toothbrushes, plastic manual toothbrushes with replaceable heads beat out bamboo ones. the authors of the study report concerns about how bamboo is cultivated. land used to grow bamboo trees decreases the variety of plants and wildlife that would otherwise thrive in the area. it turns out that there isnt a simple answer to the question of which material makes for a more sustainable toothbrush. bamboo cultivation can be very disruptive to native ecosystems; however, from a climate perspective, bamboo brushes have a lower impact than plastic toothbrushes. how does the authors choice to open the second paragraph with a question add to the discussion? the question shifts the discussion from one about general consumer choices to one about specific kinds of eco - friendly products. the question engages the reader by challenging a common assumption about bamboo products. the question encourages the reader to think about the environmental costs of using plastic. the question prompts the reader to consider how sustainability

Explanation:

The opening question "But are bamboo toothbrushes really the most sustainable option?" challenges the common - held belief that bamboo toothbrushes are the most sustainable. This engages the reader by presenting a counter - intuitive idea. It doesn't shift the discussion as described in the first option, nor does it focus on plastic environmental costs or prompt consideration of sustainability in the way the other incorrect options suggest.

Answer:

The question engages the reader by challenging a common assumption about bamboo products.