The answer is: smell
In “Two Kinds” by Amy Tan, when the age of Old Lady Chong, the piano teacher's mother, is being describe, the author uses two similes she smells "like a baby that done something in his pants” and has skin "like an old peach" appealing to the smell sense.
I believe its the ability for the word to be pronounced. This is not something that can be done in a paperback and allows the reader to know how to pronounce the word correctly.
For apex the answer is a. Jackson's use of the word "savages" suggests that he knows better than the American Indians what is good for them