Read the following context and choose the best option to answer the question.
Context: My old boss from Aero Systems called to wish me HB as well . ( His birthday is the day before mine so he always remembers to call . ) . Aside from people I know getting in touch , there are what I call fringe people who sent cards or called . My profile on Facebook wished me HB , a consumer opinion company sent an email , my dentist and insurance agent sent cards , and the Chevy dealer where I bought my car 15 months ago left a message on my phone . It 's been a great day and it 's great to have a feel good week .
Question: Why did the writer 's old boss call to wish happy birthday ?
Options: 
A. Because the writer 's profile on FB wished them happy birthday .
B. None of the above choices .
C. Because he is one of the fringe people .
D. Because he is a thoughtful person .


D