Answer: A
Blogging is a great way for companies to get their message out. Publishing false coupons is going to destroy your public image and create distrust. Creating expensive commercials is going to probably mean you need to up your sales price, which people will not like and it will cause people to likely think poorly of the company as a whole. Giving very little information about your business is going to seem mysterious and people will not want to trust you, meaning they will avoid buying from you no matter how good your product or service might actually be.