Question

studies have shown that employees are happier, healthier, and more productive when they work in an environment in which temperatures are carefully controlled. a. no change b. healthy, and more c. healthier, and they are d. healthier, being more

Explanation:

The sentence uses a parallel structure to list positive employee outcomes: "happier, healthier, and more productive". Option A maintains this correct parallel comparative form, while the other options break the parallelism or use incorrect grammar.

Answer:

A. NO CHANGE