Yesterday, the price of a loaf of bread at five supermarkets was $1.54, $1.69, $1.79, $1.57, $1.71, but today each supermarket raised its price by $0.05. what is today's mean price of a loaf of bread at the five supermarkets?
A. $1.66
B. $1.81
C. $1.76
D. $1.71