Who proposed the concept 'saltation' in evolution?

The correct answer is Option (3) → Hugo de Vries

Option (3) Hugo de Vries — Correct. Hugo de Vries, from his work on the evening primrose, said that large mutations in a single step cause speciation. He called this saltation.

NCERT Extract:
Mechanism of Evolution – “… In the first decade of twentieth century, Hugo deVries based on his work on evening primrose brought forth the idea of mutations – large difference arising suddenly in a population. He believed that it is mutation which causes evolution and not the minor variations (heritable) that Darwin talked about. Mutations are random and directionless while Darwinian variations are small and directional. Evolution for Darwin was gradual while deVries believed mutation caused speciation and hence called it saltation (single step large mutation).”