Correct Option: D

Diplodocus is a fossil of a dinosaur species unearthed in late 18th and early 19th century and it is not a living fossil. While the other three are living fossils. Elephant shrews are small insectivorous mammals native to Africa, they resemble the extinct Leptictidium of Eocene Europe, Ginkgo is a gymnosperm, and Stromatolites are a layered structure created as sediment trapped by shallow-water, oxygen-creating, blue-green bacteria. They provide the most ancient records of life on Earth by fossil remains which date from more then 3.5 billion years ago.