Rule of thumb is a guide or refs principle of some sort. For example, "as a rule of thumb, I do not begin big projects until the weekend." I hope this helps.
Answer:
The complicating incident is that the people in Samara’s community don’t have a place like a park to enjoy their outside activities. Samara feels sad that her community doesn’t have a park.
As evidence you could use this as the example from the text “As Samara waved goodbye, she started thinking about what she had seen on her walk that day. She realized that Pine Grove did not have any public spaces where everyone could go to relax and enjoy nature.”
Feel free to use different examples and word the answer differently! hope this helps.
C is the correct answer. None of the other answers have proper verbs