Tschermak-Seysenegg, a rediscoverer of Mendel's work belonged to
Erich Tschermak was an Austrian agronomist who developed several new disease-resistant crops, including wheat-rye and oat hybrids. He independently rediscovered Gregor Mendel's work on genetics. He was a plant breeder, and his hybridization experiments were done with the idea of improving crops using the laws of heredity.
So, the correct option is ‘Austria’.