<span>Would most likely be....
C.) the development of new methods of anesthesia.</span>
The answer is tragic loss because he values both of these character’s lives more than any other characters in the book.
An introduction is given about how the topic of interes will be treated.
Usually images of an explanatory nature are included, with a explanatory talk, the images are included to bring the reciver closer to the topic of interest in a friendly way.
it's purpose is to inform a non specialized public, and sometimes, without prior knowledge, so that the same present an interest in the subject.