Jan has two daughters,Ann and Betty.Each of these daughters has two sons.While all of these persons are living,Jan writes a will leaving her entire estate to her "lineal descendants,per stirpes." After Jan writes this will,the older daughter,Ann,dies.Jan dies next.If the value of Jan's estate is $120,000,how much does Ann's older son receive?
A) $20,000
B) $24,000
C) $30,000
D) $36,000
E) $40,000