A. Peak District national park is situated in central England.
B. Snowdonia national park is situated in northwest wales.
C. Yellowstone national park is situated in U.S.
D. Lake District national park is situated in England.
First National Park was established in U.S. by U.S. congress and it was named as Yellowstone national park. It was also the first national park in U.S.
So, the correct answer is 'Yellowstone'.