Question

Anyone know the answer?

Answer 1

The sequence is all perfect squares so without thinking too hard only choice A gives a sequence of perfect squares.

Looking a little harder those are perfect squares of the odd numbers, which is what choice A is as well.

Answer: A

Answer 2

Yes, A is correct
$1 = (2 \times 1 - 1)^{2} \\ 9 = (2 \times 2 - 1)^{2}$
etc.