Answer:
D) The answer to his question was clear, given that my mother was wearing the red and white bangles unique to Bengali married women, and a common Tangail sari, and had a thick stem of vermillion powder in the center parting of her hair, and the full round face and large dark eyes that are so typical of Bengali women.
Step-by-step explanation:
The clothes and the customs of a given group, that very often are a representation of their belief, is some of the many aspects that constitute what we call "culture", and the existence of a variety of cultural or ethnic groups within a society is what we called "cultural diversity."
In this excerpt, the narrator makes a reference to cultural diversity when describing the appearance of his mother: a Bengali woman wearing some particular clothe characteristic of Bengali's culture and who has the typical facial features of women there, which at the same time are very different from the culture of Western countries and of other parts of the Asia continent, for example.