Read the following example cover letter:

To Ms. March:
I was excited to see your opening for a customer support specialist with your IT firm, and I hope to be invited for an interview.
Though I don't know much about your company, my background includes serving as a customer service associate within both call-center and retail environments. Most recently, I worked as a customer service representative for Tech World, where my responsibilities included handling customer issues with computer software and equipment. Plus, I am involved in numerous clubs and associations, which allow me to hone my people skills.

How could the writer improve the cover letter?
A. Add personal hobbies and family information
B. Begin with the formal greeting "To Whom It May Concern"
C. Research the company to show background knowledge
D. Use proper spelling and punctuation