If you have been asked in interview, why do you want to work at our company? What would be your answer?

The best way to answer this question you need first of all, Spend some time researching about company then prepared and knowledgeable it. Before interview you must believe about the strategy there and find at least one reason let you convent about the company

Check Out the Company

The best way to answer this question is, first of all, to be prepared and knowledgeable about the company. Spend some time researching the company (the About Us section of the employer's website is a good place to start) so you can talk about the benefits of working for this employer.

Compare Your Goals to the Job

Compare your goals with the objectives of the company and the position, then reiterate why you would be an asset to the employer. Let the interviewer know what you can do for the company, if you get a job offer.

The best answer is to tell them that you have the capacity for the position. i.e. you are qualified for the position hence your education background, and or growth in career development.

I would simply say: because your company has offered the challenge that I have been seeking so far!

You need to define positive sides of the company and you match this position