D) Distance between corresponding points on adjacent threads is the correct answer. The pitch of a screw thread is defined as the distance between corresponding points on adjacent threads, such as the distance between the crests or valleys of adjacent threads. This is the key defining characteristic of the thread pitch. The other answer choices are incorrect: A) The angle of taper is a separate thread parameter known as the thread angle. B) The angle formed by adjacent flanks is another thread parameter known as the thread angle. C) The number of threads divided by the length is a different thread parameter known as the threads per inch (TPI).