Final answer:
The most effective heading to strengthen the author's argument against the use of earbuds is 'Experts testify to earbuds' ill effects,' which adds credibility and highlights the risk of noise-induced hearing loss and balance issues.
Step-by-step explanation:
If the author of Plugged In, but Tuned Out: The Evil Influence of Ear Buds were to add another heading to strengthen his argument, the most effective heading would be: D) Experts testify to earbuds' ill effects. This heading would directly build upon the information provided about the potential dangers of using earbuds, especially at high volumes, and their association with hearing loss. Given that the article discusses the impact of noise exposure on hearing abilities and the role of earbuds in exposing individuals to potentially harmful sound levels, expert testimony would add credibility and authority to the argument.
Key issues addressed in the article include noise-induced hearing loss, the decibels (dB) associated with everyday sounds, the damage to hair cells within the cochlea, and the importance of hearing in maintaining balance. Including expert opinions on these matters would emphasize the severity of the issue and support the author's viewpoint that earbuds can have a negative influence on hearing health.