Assuming Jack and Jill Own Land as Tenants in Common,which

Assuming Jack and Jill own land as tenants in common,which of the following statements is correct?

A) If Jack dies before Jill leaving no will,his interest in the land would be distributed according to the law of intestacy.
B) If Jill dies before Jack,Jack would be entitled to purchase Jill's interest in the land at valuation.
C) If Jill dies before Jack,her interest would be distributed according to her will.
D) All of the above.