The “barren scepter” Macbeth refers to in Scene I is a symbol implying that he

The “barren scepter” Macbeth refers to in Scene I is a symbol implying that he (point 1)
a. will never be king.
b. will have no heirs to the throne.
c. will soon be overthrown and slain.
d. prefers a smooth scepter without decoration.