Suppose a Person Buys a Share of Stock for $10

Suppose a person buys a share of stock for $10.The day before the person dies,the stock is worth $20,as it is the day after the person dies.If the stock were sold the day before the person died,the basis would be ________; if the stock were sold the day after the person died,the basis would be _________,assuming earnings on assets are taxed as they are in the current U.S.system.

A) $10; $20
B) $10; $0
C) $20; $10
D) $20; $0