Betsy's Husband Just Died

Betsy's husband just died. After 45 years of marriage she isn't very upset. But she is concerned that her stepchildren from his prior marriage will force her to sell the house they bought their first year of marriage to get a portion of the sale price. What is true of Betsy's situation?

A) The selling of her home is decided by what is said in her dead husband's will.
B) The selling of her home is decided by what is said within her dead husbands trust.
C) At the death of a co-owner, the decedent's interest automatically passes to the surviving owners.
D) All of the above.