It is that People decide to create systems designed to solve problems, but each solution creates additional problems.
It would most likely be B or C since they are the same. Dashes basically show emphasis and if the sentence inside them is taken away, the other parts of the sentence are not affected. If we took the lion part out of your sentence, the sentence would still be talking about symbolism. However it more common to use parenthesis or commas to add emphasis but that's just stylistic choice
What’s going on in the text?
A, Scientists need to continue studying what happens to players who get hit in the head.
a person killed or injured in a war or accident.
