Answer: Critics are wary of people socializing online because they think it C. limits people's social skills.
Explanation: Some people criticize social media because they consider that, by socializing online, users gradually lose the capacity to socialize in the real world. In other words, they believe that some individuals, especially teenagers, choose to spend many hours socializing online rather than going out, meeting and speaking to other people face to face. Therefore, as option C. states, these critics think that socializing online limits people's social skills.
