The correct answer is C.
To feather one’s nest means to enrich oneself, especially by dishonest or unethical means. In this case, the person in charge of the company is trying to enrich himself by using his position to benefit himself, rather than the company.
Option A is incorrect because raising the image of the company would benefit the company as a whole, not just the person in charge.
Option B is incorrect because bringing order and discipline in the company would also benefit the company as a whole.
Option D is incorrect because practicing one’s own brand of management philosophy could be done in a way that benefits the company, but it is not necessarily the case that someone who is trying to feather their nest would do this.
Option E is incorrect because diversifying the products of the company could be done in a way that benefits the company, but it is not necessarily the case that someone who is trying to feather their nest would do this.