Answer:
The answer is indeed neutral.
Step-by-step explanation:
When an author's purpose is to merely inform readers about facts, the viewpoint usually employed is a neutral one. To inform someone of a simple fact, there is no need to express emotion or feelings. Also, if the author does not intend to convince readers of his opinion, it is unnecessary to positively or negatively position himself in relation to the subject.
The passage we are analyzing here provides us with historical facts about the Alcatraz Island. It lets us know when it began to be used as a prison, what it is used for today etc. The author does not, for example, describe the fact of there having been a prison as something bad, something to be ashamed of. That would have been a negative viewpoint. He also does not compliment the current tourist attraction, saying it is fun or worth visiting. Thus, there is no positive or negative stance taken toward this subject, only a neutral one.