If x is invested in an account earning 8 percent annual interest and y dollars are invested in an account earning 6 percent annual interest, then which of the following expressions represents the annual interest earned, in dollars, on both accounts combined after one year?
A. 8x + 6y
B. 0.08x + 0.06y
C. 0.14(x + y)
D. 14x + 14y