Determine whether each sentence has correct parallel structure or faulty parallel structure. some workplaces require wearing personal protective equipment such as gloves, goggles, earplugs, and a helmet. studies show that enforcing a dress code increases productivity, strengthens unity, and is to establish the company brand. some employees must wear uniforms, such as those who work at security agencies, restaurants, and department stores. other studies show that not having a dress code at the workplace encourages self-expression, creativity, originality, and innovation.

Sentence 1, 3 and 4 have correct parallel structure, while sentence 2 has faulty parallel structure

Explanation:

The sentences 1 and four have correct parallel structure since they follow the same pattern as in sentence 1 the equipment in mention in the same way just adding the article to the last one for being singular, while sentence 4 presents a sequence of nouns in the correct way and sentence 3 is presenting nouns as well. On the other hand, sentence 2 must be revised in order to be correct by changing " and is helping to establish the company brand" for "and helps to establish...".

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i believe that the answer is b! i hope i out!