Which of the Following Holds True for Brand-Loyal Customers

Which of the following holds true for brand-loyal customers?

A) They are less sensitive to product quality.
B) The marketing costs of reaching loyal consumers are very high.
C) They need an extra push to buy a firm's brands.
D) They insulate a firm from competition with their high levels of loyalty.
E) They are a drain on a firm's finances as they need to be constantly rewarded.