The disease that attacks cattle can be far more difficult to control than the disease that attacks humans.
A thought that is grammatically complete is a sentence. A noun or pronoun component known as the subject and a verb component known as the predicate are both present in every sentence.
In this sentence, parallelism refers to the matching of word, phrase, or clause forms. Clarity is improved and your points are emphasized when you edit for parallel construction.
Therefore, option A is appropriate.
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