Step 1: Understanding the question.
The sentence asks about the state to which Mahatma Gandhi belonged. In English, when we refer to origin or belonging, the preposition **‘from’** is used.
Step 2: Grammar rule.
We use “belong from” when referring to a person’s place of origin or where someone is associated with. For example: “He belongs from Gujarat.”
The word **‘of’** expresses possession, not origin; hence, it would be incorrect here.
Step 3: Contextual explanation.
Mahatma Gandhi was born in Porbandar, which is in Gujarat, India. So the correct sentence is:
“Mahatma Gandhi belonged from Gujarat.”
Step 4: Conclusion.
Therefore, the correct preposition to complete the sentence is **‘from’.**