Evan has received permission from his state to form a corporation for his startup, expecting his liability would be limited to the amount of his investment. But his bank asked him to assume personal liability before it would grant him a business loan. Why would the bank make this demand?

Evan's business has no credit history.

Explanation:

As Evan has just created the company, it has no record about its ability to pay debt which is important for a bank to give a loan and it will not be willing to approve it if the company has no credit history that shows that it can make the payments. Because of that, it will require Evan to assume personal liability in order to have a guarantee that the loan would be paid back.