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【单选题】
设某地区消费函数 Y=C1+C2*X+U 中,消费支出不仅与收入 x 有关,而且与消费者的年龄构成有关,若将年龄构成分为小孩、青年人、成年人和老年人 4 个层次。假设边际消费倾向不变,则考虑上述构成因素的影响时,该消费函数引入虚拟变量的个数为( )
A.
1个
B.
2个
C.
3个
D.
4个
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