Explanation:
it depends what the book is about but I would say C or D
You can recognize this spider by its white stripe markings on its legs and body. The aedes aegypti mosquito is also called the yellow fever mosquito. Unlike most mosquitoes it bites in daytime and indoors as well as outdoors. This mosquito also can carry dengue.
Decoding is the reading or translating symbols into a language that is understandable or easily interpreted. It is also known as "word identification". Therefore, decoding is putting thoughts, ideas, and feelings into words and messages. Decoding also means to decipher or to translate.
All of these could be considered an "author's purpose". An author is technically anyone who writes anything, therefore the purpose of writing is theoretically limitless. If you have to choose one of these, however, it would be "to remind".