The correct option is C I and II only
The poet thinks that he saw his wife's ghost so "Rescu'd from death" is definitely a reference to her. Then, in line 2, he says he saw his wife's ghost just like Jove's son had shown an image of the dead Alcestic to her husband, so line 4 is also a reference to Alcestic. However, it does not refer to Alcestic's husband. So the correct answer is C.