I'm i think its b because it makes more sense, i'm pretty sure it's b
Answer: He is referring to his discovery that the secret to a creative writing for him was using a method of word-association to write fiction.
Explanation: He would get up every morning and write down at his desk any string of words that would come to him. Then he would begin to develop a story from it.
He would take walks along familiar places and go down memory lane writing on acquintances and loved ones he once knew or that had passed on.
I presume you meant to say "How many bones does the body have?" A simple answer would be around 270 at birth,, and over the years it decreases to around 206.