Answer choices:
A. amount of charge that produced the field.
B. distance from the charge.
C. amount of charge on a test charge placed in the field.
D. both the first and second choices listed above.
Answer: D. both the first and second choices listed above.
Why: Both of the answers are connected. The distance from the charge makes the charge weaker. Making the charge more powerful allows the charge to reach a further distance. Think of it like WiFi, the further you are from the router, the weaker the WiFi strength.