In the case of incomplete dominance, what is the phenotypic ratio of monohybrid cross in $F_2$ generation?

The correct option is B 1:2:1
In incomplete dominance, the phenotypic ratio of monohybrid cross in $F_2$ generation is 1:2:1, the same as the genotypic ratio. This scenario arises because neither allele is dominant; if both the alleles are functional, a red coloured phenotype is produced; if a single functional allele is present (heterozygous) an intermediate (pink) phenotype is formed.