Lead /'lEd/ v. a: to guide on a way especially by going in advance
b: to direct on a course or in a direction
c: to serve as a channel for

lead /'led/ n.
a: a heavy, soft, bluish-white metallic element found mostly in combination and used especially in pipes, cable sheaths, batteries, solder, and shields against radioactivity
b: a thin stick of marking substance in or for a pencil

Which sentence uses the noun lead as it is defined in the second dictionary entry?
A.
Grant took lead of the expedition.
B.
Felix wanted to lead the tour but was too sick to do so.
C.
Great leaders always lead the way.
D.
The lead in the pencil had been worn down to the eraser.