Improve the following sentence, if necessary, by choosing the most appropriate option: "Raman wants to dispose off his house."

Introduction / Context:
This sentence improvement question tests knowledge of correct verb preposition combinations in English. The expression "dispose off his house" is slightly wrong and very common among learners. Standard English uses the phrasal verb "dispose of something" when we want to say that someone gets rid of, sells, or transfers ownership of something such as a house, property, or asset.

Given Data / Assumptions:
- The original sentence is "Raman wants to dispose off his house."
- The intended meaning is that Raman wishes to get rid of or sell his house.
- The options present different ways of expressing this idea, including a possible "No improvement" choice.
- We must choose the most natural and grammatically correct sentence in standard English usage.

Concept / Approach:
The key concept is the correct use of the verb "dispose". When used transitively in modern English with an object, the normal pattern is "dispose of something". The preposition "of" is part of the phrasal verb. "Dispose off" is incorrect because "off" is not the preposition that collocates with "dispose" in this sense. Noun forms like "disposal of property" are also common, but they change the structure of the sentence. The safest and most natural improvement is to keep the simple pattern "wants to dispose of his house".

Step-by-Step Solution:
Step 1: Identify the problematic phrase "dispose off his house". Step 2: Recall the standard pattern "dispose of something", for example "dispose of waste", "dispose of assets". Step 3: Replace "off" with "of" while keeping the rest of the sentence intact: "Raman wants to dispose of his house." Step 4: Check the options. Option A gives exactly this corrected sentence and preserves the intended meaning clearly. Step 5: Confirm that no other option improves the sentence better than A.

Verification / Alternative check:
Try reading each option aloud. "Raman wants to dispose of his house" sounds natural and idiomatic. "Raman wants the disposal off his house" and "Raman wants the disposal off of his house" are both awkward and mix noun and preposition in an incorrect way. The expression "disposal of his house" could occur in a longer phrase like "Raman wants to arrange for the disposal of his house", but that is not offered in the options. Therefore option A is the only correct and simple improvement.

Why Other Options Are Wrong:
- "the disposal off his house": uses "off" instead of "of" and shifts from verb to noun in an unnatural way.
- "the disposal off of his house": repeats the same error and becomes even more clumsy with "off of".
- "No improvement": cannot be correct because "dispose off" is not accepted standard usage.

Common Pitfalls:
A common error is to assume that "off" is the correct partner for verbs meaning removal. In many phrasal verbs "off" is used, but "dispose" is an exception. Learners often copy this mistake from informal speech. To avoid it, remember standard collocations like "dispose of garbage", "dispose of old clothes", and "dispose of property".

Final Answer:
The correct improved sentence is Raman wants to dispose of his house.