Final answer:
In 'Macbeth,' the Earl of Northumberland is Siward, who is also a veteran soldier and Malcolm's uncle.
Step-by-step explanation:
In Shakespeare's play "Macbeth," the character who holds the title of the Earl of Northumberland and is a veteran soldier of the English King as well as Malcolm's uncle is C) Siward. The characters Macduff, Banquo, and Ross do not hold this title. Siward plays a significant role in the latter part of the play, particularly in the battle against Macbeth.In Shakespeare's play "Macbeth," the character that holds the title of the Earl of Northumberland, being a veteran soldier of the English King and Malcolm's uncle, is C) Siward.