How would you change "Everyone is concerned about climate change" using "regarding"?

The correct transformation of the sentence "Everyone is concerned about climate change" using the word "regarding" is found in the choice that states, "Everyone is concerned regarding climate change." This option correctly maintains the meaning of the original sentence while incorporating the term "regarding" as a preposition that indicates the subject matter of concern.

Using "regarding" in this context effectively conveys a similar sense of focus as "about," but with a more formal tone. It indicates that the concern is specifically related to the topic of climate change, ensuring that the connection is clear and precise.

Other options do not correctly reflect the original intent or structure of the sentence. For instance, using "for" or "in" doesn't maintain the same meaning as "about," leading to a grammatically incorrect or awkward sentence. The phrase "concerned with" in another option might convey a slight variation in meaning, suggesting an active involvement rather than mere concern, which diverges from the focus of the original statement. Thus, the correct choice successfully rephrases while preserving the essential meaning of concern related to climate change.