Read the passage and answer the given question
Once while travelling by the local bus, I got a seat beside a very strange man. He seemed interested in every passenger aboard. He would stare at a person, scribble some odd mathematical notations on his long notebook and then move on to the next. Being quite interested in what he was doing I asked him what all those notations meant and then came the startling reply. He saw a man's face not as a single unit but as thousands of squares put together. He was in fact a statistical expert and a budding artist learning the art of graphics.
Question: The man caught author's attention because

Options

A. a) He was sitting next to him
B. b) He was staring at every person in the bus
C. c) He would stare at every person and then scribble down
some mathematical notation
D. d) He was a budding artist learning the art of graphics