For a mortgage lender that makes mortgage loans to borrowers, which one of the following would be an example of adverse selection?

a$.$ Individuals most likely to default are the ones most likely to apply for the loan.

b$.$ Borrowers investing their loan proceeds differently than the bank requires.

c$.$ Individuals least likely to default are the ones most likely to apply for the loan.

d$.$ After the loan has been made, individuals become careless with their finances.