Why ranunculus is classified as a dicotyledonous plant

answer; i believe is(b)converging

not the best question format lol but what i think might as scale color is controlled by a single gene with two alleles, the green allele and the yellow allele. when moths that are homozygous for green scales are mated with moths that are homozygous for yellow scales, 100% of the offspring have green scales.

answer; ///(b) it is composed of four protein chains and four heme groups;