Answer:
The sentence that is written from the third-person point of view is:
2. The building was so tall that, at times, clouds blocked the view of the top.
Step-by-step explanation:
To distinguish between first-person and third-person points of view we can simply focus on the pronouns being used. First-person point of view will use first-person pronouns such as "I", "my", or "me". It can also use first-person pronouns in their plural form, such as "we", "our" or "us". Having that in mind, we can eliminated options 1, 3, and 4. On the other hand, option 2 does not use any first-person pronouns, which is an indicative that it is most likely written in the third-person point of view:
2. The building was so tall that, at times, clouds blocked the view of the top.