Which of the following correctly revises the sentence below?
'The director of the company and owner of the factory along with his advisors are making a plan to improve efficiency.'
Correct: A
The main subject 'director of the company and owner of the factory' is singular (assumed as one person), so the verb should be 'is'. The additive phrase 'along with his advisors' does not change the subject-verb agreement. Choice A corrects this. Choice B pluralizes incorrectly, choice C uses 'theirs' incorrectly, and choice D changes the original meaning by adding 'the' to 'company' unnecessarily.