Well, this answer can be many things! I would say "When you read carefully in order to determine the meaning of a challenging word, you are 'using context clues'", perhaps? Maybe not...how about "...using prior knowledge"? Since you didn't offer any alternative answers, or list any answers, I can only guess. I hope I helped you a little bit!
Answer:
A. The word "while" helps the reader determine that the character goes to the market at the same time the water is heating.
Explanation:
Explanation: john has only read two books, a scientific journal his mother acquired while working in the hatchery, and The Complete Works of Shakespeare. The name of the second book was The Chemical and Bacteriological Conditioning of the Embryo.