The correct answer is: The problem of housing in India is a complex one.
The word “problem” is a noun that refers to a situation that is difficult or troublesome. The word “housing” is a noun that refers to the provision of accommodation for people. The word “India” is a noun that refers to a country in South Asia.
The preposition “of” is used to indicate possession or association. In this case, the preposition “of” is used to indicate that the problem is associated with housing. The preposition “in” is used to indicate location or position. In this case, the preposition “in” is used to indicate that the problem is located in India. The preposition “for” is used to indicate a purpose or goal. In this case, the preposition “for” is not used correctly because the problem is not a goal. The preposition “about” is used to indicate a topic or subject. In this case, the preposition “about” is not used correctly because the problem is not a topic.
Therefore, the correct answer is: The problem of housing in India is a complex one.