Charlie writes the steps shown to describe the use of a
transistor in a closed circuit with flowing current.

Using a Transistor to Amplify a Signal
1. Current (14) flows from the base to the emitter.
2. An input causes a small increase in voltage across the
base and emitter.
3.7, increases a small amount.
4. Current (2) flowing from the emitter to the collector
changes a large amount.

Which change corrects the error in his steps?

A. Change the title to "Using a Transistor as a Switch."
B. Change step 1 to say that no current flows in the
transistor at the start.
C. Reverse the sizes of the changes in current in steps 3
and 4.
D. Reverse the direction of current in step 4.