To match List-I with List-II correctly, let's analyze each type of inheritance and its corresponding example:

Incomplete dominance: This is when the heterozygote displays a phenotype that is intermediate between the two homozygous phenotypes. The classic example of this is the flower color in Antirrhinum (snapdragon). In this case, the heterozygous flowers have a color that is a blend of both parental colors, which is different from either homozygous parent. Therefore, Incomplete dominance matches with "Flower colour in Antirrhinum".

Co-dominance: This refers to a situation where both alleles in a heterozygote are fully expressed, resulting in a phenotype that displays both traits equally. A common example of this is blood groups in humans. In the case of the ABO blood group system, both A and B alleles are expressed in individuals with AB blood type. Therefore, Co-dominance matches with "Blood groups in human".

Pleiotropy: This occurs when one gene influences multiple traits. Phenylketonuria (PKU) is an example where a single genetic defect in the phenylalanine hydroxylase gene results in multiple symptoms in different organs. Therefore, Pleiotropy matches with "Phenylketonuria".

Polygenic inheritance: This refers to situations where multiple genes influence a single trait. An example of this is skin color in humans, where multiple genes contribute to the phenotype. Therefore, Polygenic inheritance matches with "Skin colour in human".

Based on this analysis, the correct matching would be:

(A) Incomplete dominance - (II) Flower colour in Antirrhinum

(B) Co-dominance - (I) Blood groups in human

(C) Pleiotropy - (IV) Phenylketonuria

(D) Polygenic inheritance - (III) Skin colour in human

Therefore, the correct option is:

Option B: A-II, B-I, C-IV, D-III