Final answer:
The first partial skeleton of a dinosaur discovered in North America was found in a) New Jersey.
Step-by-step explanation:
The first partial skeleton of a dinosaur discovered in North America was found in New Jersey. This partial skeleton, known as Hadrosaurus foulkii, was found in 1858 by William Parker Foulke in Haddonfield, New Jersey. It is one of the most important dinosaur discoveries in North America and played a significant role in the early understanding of dinosaurs.