Answer:
On the other hand, some experts point out that people have successfully rebelled throughout history without the benefit of social media.
Explanation:
The above sentence actually contrasts with the ideas in the sentence that is highlighted in red.
The sentence highlighted in red states that "This is an internet revolution," Ghonim said. "I'll call it Revolution 2.0". This statement actually reveals that Ghonim supports the fact that the revolution that took place in Egypt was actually a reality due to the availability of the internet.
But the above selected sentence contrasts that as some experts believed that the issue of people rebelling has been taking place in the past without the use of the internet or social media.
So, the selected sentence above is the correct answer.
