The basic sequence within a lightning flash includes all but which of the following?
A. Discharge begins within the cloud and initiates a dimly visible, negatively charged stream of electrons propagating downward.
B. The connection initiates the return stroke, sending positive charges up to the cloud with a brilliant flash; more lightning strokes occur as charges flow between the cloud and the ground.
C. The conductive stream moves earthward in 50-meter jumps as a stepped leader; as the stepped leader nears the ground, the electric field at the surface increases greatly, shooting streamers of positive sparks upward and connecting with the stepped leader about 50 meters above ground.
D. Static electricity builds up within the lower thundercloud and induces identical-polarity charges on the ground.
Answer: D
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