题目内容：
根据以下内容，回答题。From: David Johnson <davidlove@nextdesign.com>
To: Eric Anderson <andersonl618@adlove.com>
Hello, Eric. Thanks for your email. First, I'd like to say how pleased I was to hear that your company accepted our bid to design your new ad campaign. We will be using a subcontractor to handle all of the printing for this campaign, including pamphlets and signs. In the past, we have used a company called Quality Press. It is a subsidiary of Printco, and is quite reliable. I will send you a list of their estimated costs, along with a spreadtsheet outlining the revision to our proposed schedule.
Also, I have assigned one of our staff members to assemble a task for that will be in charge of consumer research for this project. Her name is Karen Lopez and she's a specialist in market trends. She will be mailing you a packet containing a summary of our preliminary market research later today.
David Johnson
What type of the company does Mr. Johnson most likely work for? A．A television station
B．An advertising firm
C．An accounting firm
D．A printing company
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