The correct answer is option 3, F G Hutchins. According to F G Hutchins, the Indian independence movement was a `spontaneous revolution`.

Option 1, Gordon Johnson, is not the correct answer. There is no mention of Gordon Johnson describing the Indian independence movement as a `spontaneous revolution`.

Option 2, David Arnold, is also not the correct answer. There is no mention of David Arnold describing the Indian independence movement as a `spontaneous revolution`.

Option 4, Peter Robb, is not the correct answer. There is no mention of Peter Robb describing the Indian independence movement as a `spontaneous revolution`.

In summary, among the given options, only F G Hutchins has described the Indian independence movement as a `spontaneous revolution`.