The core concept is the nuanced difference between 'involved' and 'include'. 'Involved' often implies active participation or being caught up in something, while 'include' signifies containing something as part of a whole. Option C directly reflects this difference. Option A is incorrect because 'include' can be as general as 'involved'. Option B misinterprets 'include' by associating it with being surrounded. Option D is wrong because both terms can apply to both physical and abstract elements.