Retail sales volume in local urban and rural areas rose 57.8 percent and 46.8 percent, ______, over February 1995.

A．individually

B．respectively

C．correspondingly

D．accordingly

某工程填土经室内击实试验，得到含水率和干密度见表，试绘制击实曲线，并求最大干密度和最优含水率。