Peter is 65 years old and has just attended his retirement party. He has amassed $1.50 million in retirement savings. He and his spouse have figured out that during retirement, they need to withdraw $100,000 at the end of each year from their retirement savings to maintain the standard of living that they would like to have. If they can earn 5% interest on the unspent balance in their retirement account, how many years will it be before their retirement savings are exhausted?

a. 24

b. 30

c. 26

d. 32

e. 28