Read the following context and choose the best option to answer the question.
Context: As a Navy clinical psychologist assigned to a Marine operational unit , I was authorized to wear their uniform . The corporal rolled forward in his wheelchair and shook my hand firmly . " You have no idea how great it is to see that uniform , ma'am , " he said with a grin .
Question: Why did the corporal grin ?
Options: 
A. He thought a woman in uniform was funny .
B. He appreciated seeing the familiar uniform again .
C. None of the above choices .
D. He and the woman shared a joke .


B