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已知基础梁上墙体高12m，墙厚为370mm(如图所示)，单面抹灰，采用MU10烧结普通砖M5混合砂浆砌筑，柱距6m，基础梁长5.095m，伸入支座0.5m，混凝土采用 C30，纵筋采用HRB335钢筋，箍筋采用HPB235钢筋。基础梁断面尺寸为b×hb=370mm×450mm(按自承重墙梁分析)。使用阶段托梁正截面承载力计算时，其跨中截面的弯矩Mb和轴心拉力Nb,分别接近下列______组数值？

A.68.03kN·m，145.87kN

B.35.98kN·m，145.87kN

C.68.03kN·m，49.65kN

D.35.98kN·m，49.65kN

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