Quantitative/polygenic inheritance was first noted by
Inheritance is controlled by two or more genes in which the dominant alleles have cumulative effect, with each dominant allele expressing a part of functional polypeptide and full trait is shown when all the dominant alleles are present, is called Polygenic or Quantitative inheritance. This was first noted by H.Nilson – Ehle and East.
So, the correct option is 'H.Nilson - Ehle and East'.