If the underlined words are to practice hard the answer is C
From what I understand it's symbolism.
Definition: Symbolism is the use of symbols to signify ideas and qualities by giving them symbolic meanings that are different from their literal sense. Symbolism can take different forms. Generally, it is an object representing another to give it an entirely different meaning that is much deeper and more significant.
Internet addiction can cause people to be less social.
Internet addiction can be found among a variety of age groups, not just teenagers and young adults.
Internet addiction is linked to obesity./ Internet addiction can aid in becoming obese.
Internet addiction can cause people to come into more contact with content that negatively impacts brain health. (ex. cyber bullying, people who want to commit suicide, hate websites, websites promoting disorders such as anorexia, etc.)
I hope this answered your question or at least helped.