I think your teacher made a mistake in Option 2. I believe he/she computed 2^15 =$32,768 as the amount of money in the account on the 15th day. But that is NOT so, if you begin with a deposit of $1 on day 1 and on the 15th day, you will have:2^(15-1) =$16,384. You can easily list them and see for yourself: 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1,024, 2,048, 4096, 8,192, 16,384(15th day deposit). I think what they did was simply raise 2^15 =$32,768. This would have been true if the first day's deposit was $2 instead of $1.
Optio A is a straightforward as: $750 x 30 + $10,000 =$32,500(on 30th day)
Because a mistake appears to have been made, then Option A is obviously the better deal.