Final answer:
Similar dinosaur fossils indicate that rocks in Tanzania and the United States date back to the same Late Jurassic period, which is the correct answer to the question.
Step-by-step explanation:
The similarity in dinosaur fossils suggests that rocks located in different parts of the world can be dated to the same geologic time period due to the presence of these fossils. For the rocks in question, those with similar dinosaur fossils indicating a Late Jurassic age are found in Tanzania and the United States. During the Late Jurassic, dinosaurs were abundant and diverse, and their fossils can be used as indicators for dating rock layers (stratigraphy). Therefore, the correct answer to the question is D. Tanzania, United States.