The new dictionaries are very useful. They _______ well and _______ already.

A．sell; have been sold out

B．sold; had sold out

C．sell; sell out

D．are sold; have been sold out

陈先生有房可租可购，以5年为期计算，租房租金每年3万元，购房房价80万元。可办理60万元，利率4%的房贷，5年平均摊还。假设折现率4%，以净现值法计算，则 5年后售房时，房价应达到( )万元以上，购房才比租房划算。

A．85.0

B．83.5

C．81.09

D．80.05