Final answer:
The passage indicates that lipreading is physically and mentally exhausting for the author, best supporting the inference that lipreading is exhausting (option B).
Step-by-step explanation:
- The best-supported inference about paragraph 71, based on the provided passage, is B. Lipreading is exhausting for the author. The passage clearly states the physical and mental strain the author experiences during the process of lipreading.
- Terms such as "grow too tired," "muscles behind my eyes ache," and "my corneas go dry; my vision gets blurry" indicate the extent to which lipreading tires the author.
- The description of the guessing game the author can never quite win, and the visual of the words melting away also underline the exhaustion and difficulties associated with this form of communication.