Which is the best version of the underlined portion of sentence 4 (reproduced below)?
All companies should follow Googles model and realize that when their employees are happy, they are more productive, more proactive, and more invested in the company.

This answer choice is correct because “Google’s” is a possessive noun in the sentence, not a plural noun. Therefore, the writer needs to place an apostrophe in between the “e” and the “s” in the word. “should follow Googles model, and realize” might be tempting, but a comma at that point in the sentence would be superfluous.