According to the author, Dubai:
Explanation:
Dubai has pledged to become the happiest city in the world. However, the paragraph does not mention that it is already on its way to achieve this target. Thus option 1 can be negated. There is not connection of Facebook and Dubai mentioned in the passage. Negate option 2. Option 3 is stated in the first sentence of the fourth paragraph. Retain it. Option 4 is beyond the scope of the passage and can be negated. Hence, the correct answer is option 3.
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