Jane Had Two Teenaged Sons

Jane had two teenaged sons.Her husband died when the boys were 14 and 16.She met Jack,who had a son and daughter by his first marriage.He was divorced from both a first and second wife.Jane and Jack decided to marry.After the marriage,they bought a house as co-owners.Which of the following is true with regard to co-ownership?

A) If the type of co-ownership is not stated on the conveyancing documents, they will take possession as joint tenants.
B) If they co-own the property as joint tenants, Jane could control what happened to her share upon her death by a well-crafted will.
C) If they took the property as tenancy in joint tenants and Jane decides that she does not want the "right of survivorship," she cannot change that type of ownership without his permission.
D) A joint tenancy cannot be severed by one party selling his or her interest.
E) If it is a joint tenancy and no changes are made, if Jane dies first, Jack gets the whole property.