"the ancient pyramids in egypt were so symmetrical and well-built that they must have been constructed by aliens from another planet."

what type of fallacy is it? select a type of fallacy from the list above.

Extravagant hypothesis.

Explanation:

Fallacies represent the error/flaw in reasoning that spoils the validity of the argument. An extravagant hypothesis is a kind of fallacy that occurs when an exaggerated or unlikely explanation or comparison is provided unnecessarily where a simpler or less elaborate description could work more efficiently. Similarly, this example proposes an extravagant comparison(with 'aliens') that represents a flaw in logical reasoning(comparison here) that neglects the effectiveness of the intended meaning. Thus, it exemplifies the 'extravagant hypothesis' fallacy.

gerund phrase: giving more than a person needs.

noun use: predicate noun.