Select the word-pair that best represents a similar relationship to the one expressed in the pair of words given below. (The words must be considered as meaningful English words and must not be related to each other based on the number of letters/number of consonants/vowels in the word.)
Flower - Petal

Correct option is B

Logic:
Petals are modified leaves that surround the reproductive parts of flowers. 
A fruit is the ripened ovary and associated bits containing seeds, while a seed is a ripened ovule, containing the embryo and enough stored food to sustain it through the process of germination and the early development of the seedling. 
Petal is parts of flowers.
Similarly,
Seeds are parts of fruits.