Answer:
The correct answer would be B. Neither purple flowers nor white flowers are dominant.
It can be explained with the help of codominance.
Codominance is a situation in which both the alleles of a gene are equally dominant and express themselves completely in a heterozygous condition.
For example, in ABO blood group system allele
and
are codominant while
is recessive.
Similarly, in the above experiment purple and white flower color trait are codominant or we can say that neither is dominant over each other.