Answer:
B
Explanation:
Let's not make it complicated. The original text used stuff about, making it less informal and casual. Although the question is looking for a more concrete phrase, A and D doesn't look like a better way to write it.
Maybe consider C but it's highly likely its B.
The general point is "Carla is a pleasure to be around." This is non specific.
All other points outline specific attributes that support this statement, referring to her smile and willingness to listen and ask questions.
To Stop the destruction of the earth's resourses