A Mendelian experiment consisted of breeding tall pea plants bearing violet flowers with short pea plants bearing white flowers. The progeny all bore violet flowers, but almost half of them were short. This suggests that the genetic make-up of the tall parent can be depicted as

This dihybrid cross examines two sets of features, notably plant length and blossom colour.
The plant in issue is heterozygous for tallness because half of the offspring are short plants and homozygous for violet flowers because all of the flowers in the progeny are violet in colour. Due of the double recessive nature of the other parent, neither of the two alleles will be expressed. We can easily picture the outcome in terms of the gametes that the first plant will produce, i.e., "TW" which, when mixed with "tw," will result in a tall violet plant (TtWw), and "tw," which, when mixed with "tw," would result in a dwarf white plant (ttww).

So the answer is (c) TtWW.