What contributes to the conflicts between Tristan and Alfred？

A.Samuel’s death as well as Susannah’s falling in love with Tristan.

B.The fact that Tristan does not save Samuel’s life in the war.

C.The fact that Susannah falls in love with AlfreD.D.The fact that Susannah falls in love with Tristan.

正确答案：Samuel’s death as well as Susannah’s falling in love with Tristan.