Final answer:
A lender may require you to obtain PMI when the down payment is less than 20%. The correct option is (B).
Step-by-step explanation:
When the down payment is less than 20%, a lender may require you to obtain PMI (Private Mortgage Insurance). PMI is a type of insurance that protects the lender in case you default on your loan.
It is typically required when the loan-to-value ratio (the amount of the loan compared to the value of the property) is higher than 80%. PMI allows borrowers to make a lower down payment, but it increases the overall cost of the loan.