The correct answer is C. <span>Protesting apartheid is too dangerous to be worthwhile.</span>
The sentence that uses parallel structure is option A) “We searched for the lost keys in the yard, inside the toy box, and in my purse.” since it uses the same grammar structure when listing things. In this case, the grammar pattern followed is a prepositional phrase that modifies the verb “searched”. The prepositional phrases are “in the yard”, “inside the toy box” and “in my purse” since all of them start with a preposition.
In the rest of the sentences there is a break in the pattern when listing the items so no parallelism is possible. In option D) for example, there is a mix of grammar structures since it starts with prepositional phrase “in the yard”, followed by a noun phrase “the toy box”, and finishes with verb phrase “looked in my purse”.
It would show the other side of the argument in order to disprove or show that it is not true. It could also potentially give the editorial and the author credibility that they knew what they were talking about.
I hope this helped! Good luck! :)