During the Renaissance, many artists were trying to draw the human body more accurately. Artists like Leonardo studied the skeleton and musculature (the muscle system) to make their paintings and sculptures of the human body more realistic. Leonardo also studied birds and seashells. He conducted in-depth studies of human anatomy, much as doctors did. He filled notebooks with detailed drawings of bones, muscles, and internal organs

Which sentence is not part of the focus?

A. Artists like Leonardo studied the skeleton and musculature…
B. He filled notebooks with detailed drawings…
C. He conducted in-depth studies of human anatomy, much as doctors did.
D. Leonardo also studied birds and seashells.