The correct options are
A It is the distance between two successive screw threads.
C The distance traveled by the tip of the screw for one complete rotation of the head.
D Pitch = Distance traveled on the pitch scaleNo. of rotations of the head scale
The pitch of the screw is the distance between two successive screw threads. It can also be defined as the distance traveled by the tip of the screw for one complete rotation of the head.
Thus, Pitch=Distance traveled on the pitch scaleNo. of rotations of the head scale