From the given sentence, form a feminine noun from the masculine one, by placing a word before or after:
The sight of the peacock fluttering its beautiful feathers is a pleasure to watch. [Basic]The answer to the given sentence is Option B, Peahen.
As per the question, the sentence would have the male gender noun to be replaced by the feminine noun, by adding a word before or after that. The male noun, ‘Peacock’, is a bird which possesses a feature of beautiful long feathers which tends to expand and form a semicircular shape when it rains. The only Option correct in the manner of meaning and being the exact feminine counterpart is ‘Peahen’, that is Option B.
The rest other options are all words, which do not actually exist and are hence wrong making option B the correct answer.