The sentence that best uses a signal phrase to credit the information from this source is option D: Ornithologist Lee Sparks describes Harpy Eagles as birds that have "a majestic and enchanting appearance but are insanely dangerous predators."
This sentence introduces the information by clearly stating that it comes from Lee Sparks, who is an ornithologist. The use of the signal phrase "Ornithologist Lee Sparks" helps credit the information to the source and establishes the expertise of the person providing the description of Harpy Eagles. Additionally, the sentence accurately conveys the main points of the description from the online entry, mentioning the majestic appearance and dangerous predatory nature of the Harpy Eagles.
Using a signal phrase like "Ornithologist Lee Sparks" is important when citing information from sources because it gives proper credit to the author and adds credibility to the information being shared. It also helps readers understand that the information is not the author's own opinion but rather a description from an expert in the field.
I hope this helps! Please feel free to ask any questions if necessary. :)