The sentence that uses parallelism in this passage is option A) “King grabs power by gathering armies, fighting wars, and building castles.” For a sentence to properly use parallel structures, it must have verb tense agreement and also follow the same pattern. Parallel structures are useful writing resources that add coherence to a text. In this sentence, pattern is followed by using the same gramar structure “verb+ing” as in “gathering”, “fighting”, and “building”. It also uses an object after each “verb + ing” as in “armies”, “wars”, and “castles”. The other sentences do not use parallel structures since the pattern mentioned previously is not followed.