(A) Law of independent assortment describes the inheritance of different traits independently. This is typically observed in a dihybrid cross, which results in a phenotypic ratio of (I) 9:3:3:1.

(B) Incomplete dominance is a type of inheritance in which two contrasting alleles both express themselves incompletely, resulting in a phenotype that is intermediate between the two parental phenotypes. (IV) Flower colour in Snapdragon is a classic example of incomplete dominance, where a cross between a red-flowered and a white-flowered Snapdragon produces pink-flowered offspring.

(C) Law of dominance states that in a heterozygote, one allele will mask the presence of another allele for the same trait and express itself phenotypically. A monohybrid cross exhibiting complete dominance typically results in a phenotypic ratio of (II) 3:1 in the F2 generation.

(D) Co-dominance is a type of inheritance in which both alleles of a gene are equally expressed in a heterozygote, and the phenotype shows the effect of both alleles. (III) AB blood group in humans is an example of co-dominance, where individuals with both the A and B alleles express both antigens on their red blood cells, resulting in the AB blood type.

Therefore, the correct matches are:

• A - I
• B - IV
• C - II
• D - III

Now, let's look for the option that represents this matching. Since the options are not provided in your question, I will present the correct matching:

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