Answer:
The correct answer is letter "B" and "C": Correct mistakes politely; Be open about when and how you will improve the situation.
Explanation:
E-mails are fast mediums of communication but somehow have a degree of informality. In business writing, e-mails directed to partners, suppliers or consumers must be clear, positive, and resourceful. While sending messages to consumers, moreover in front of claims, it is imperative to be objective in providing information. If it is necessary to correct the client's point of view the correction must be done politely.
If the mistake comes from the merchant's end, it is crucial to let the consumer know what the steps to solve the issue are and an estimate of when the problem should be resolved.