设{a_n}为公比q>1的等比数列，若a₂₀₀₉和a₂₀₁₀是方程4x²-8x+3=0的两根，则a₂₀₁₁+a₂₀₁₂=[ ]

A.18            

B.10               

C.25　　　      

D.9