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Ideally the question should ask: 'What are the two terms immediately adjacent to 9'.

Here we know that a2 = (a1-1)^2, a3 = (a2-1)^2.. and so on..

so the term immediately after 9 = (9-1)^2 = 8^2 = 64

Let the term previous to 9 be x.
9 = (x-1)^2 or x-1 = 3 Or x-1= -3
which gives two values of x: x = 4 or x = -2
But since its given that its a sequence of positive integers, we will ignore -2. Thus the previous term is 4.

So the two terms immediately adjacent to 9 are : 4 and 64

hence answer is C

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