一负电荷从电场中A点由静止释放，只受电场力作用，沿电场线运动到B点，它运动的v-t图象如图所示。则A、B两点所在区域的电场线分布情况可能是图中的

A．

B．

C．

D．

Marko Tskitishvili, an economist, has been studying the drop in the price of the average household computer in the U.S. and wonders if computers should still be considered a luxury good or if it has now become a normal good. He conducts a survey of 500 people and finds the following:

Assume that 1998 is the base date. Based on the above data, Tskitishvili would conclude that a computer is a:（）

A. luxury good with income elasticity of 1.01.

B. normal good with income elasticity of 0.84.

C. luxury good with income elasticity of 1.18.