Select the two details that best support the conclusion that Alfred or John killed Emily?

One morning at Styles Court, the household woke to the discovery that the owner, elderly Emily Inglethorp, had died. She had been poisoned. Emily was a woman of wealth from her previous marriage. Currently, the people living with her are her new husband, Alfred Inglethorp, her stepsons (from her first husband's previous marriage) John and Lawrence Cavendish; John's wife Mary Cavendish; Cynthia Murdoch, the daughter of a deceased friend of the family; and Evelyn Howard, Emily's companion. In Emily's will, John will receive the manor - he inherits the property from her, because of his father's will. However, the money she inherited would be distributed according to her own will, which she changed at least once per year; her most recent will favors Alfred, who will inherit her fortune. On the day of the murder, Emily had been arguing with someone, suspected to be either Alfred or John. She had been quite distressed after this, and apparently made a new will - no one can find any evidence that it exists. Alfred left the manor early that evening and stayed overnight in the village. Meanwhile, Emily ate little at dinner and retired early to her room, taking her document case with her; when her body was found, the case had been forced open and a document removed. Nobody can explain how or when the poison was administered to her.