Apple, the company that has the highest revenue per employee, focusses

Which is it? is it A or C?
My first impression is that it's A, because the intended meaning is that Apple focuses more on those things than its competitors do, not that Apple focuses more on those things than ON competitors. These are two different meanings and it's difficult to understand author's meaning.

Great question Sachin. The concept behind your doubt is one of the main things being tested in this question. If I were to generalize your question, what you are asking is "when can we omit the helping verb and when can we not". We have explained this in detail in the article below: Please review it thoroughly and then apply the learning on the sentence in this question.
https://e-gmat.com/blogs/?p=194

We omit words (ellipses) only till the point the sentence communicates clear meaning. There should not be any ambiguity in the meaning communicated by the sentence.
Let's take the sentence again: this time simplified version of the sentence:

Apple focuses more on simplistic and functional design than its competitors.
As discussed in the official solution, there are two possible interpretations of this sentence. Now what I will do is progressively start to omit words and see what I get when I omit too much.

A: Apple focuses more on simplistic and functional design than its competitors do.
Expanded1 A: Apple focuses more on simplistic and functional design than its competitors focus.
Expanded2 A: Apple focuses more on simplistic and functional design than its competitors do. {replacing focus with do}
Expanded3 A: Apple focuses more on simplistic and functional design than its competitors do. {Omitting do}

B: Apple focuses more on simplistic and functional design than on its competitors.
Expanded B: Apple focuses more on simplistic and functional design than Apple focuses on its competitors.
Expanded2 B: Apple focuses more on simplistic and functional design than Apple focuses on its competitors. {omitting SV}
Expanded3 B: Apple focuses more on simplistic and functional design than on its competitors. {omitting on}

Notice that Expanded3A is same as Expanded3B = simplified original choice A. In both cases when I omitted too much i.e. omitted "do" in case A and omitted "on" in case B, I got a sentence that is now ambiguous.

And hence the takeaway:

1. The sentence must be constructed in such a way that the comparison is absolutely clear. As we saw in this case due to omission of words, the comparison was no longer clear. So when we omit words we should always make sure that the comparison does not become unclear.

I hope this helps clarify the confusion. In addition to this question, apply this learning on the official question from OG Verbal Review 2 - #103.

Regards,

Payal

Apple, the company that has the highest revenue per employee, focusses more on simplistic and functional design than on its competitors design.