The best answer is:
Yes, the search engine is narrow AI because it uses machine learning algorithms.
This is the best answer because a narrow AI, also known as weak AI, is designed to perform specific tasks and functions based on pre-programmed algorithms and data. In this case, the search engine is using machine learning algorithms to build search hierarchies, which falls under the category of narrow AI. It does not display the general intelligence and cognitive abilities of a human like a general AI would.