[单选题]
Two point charges, initially 2.0 cm apart, 4; sqfo7tit8dexperio7)u uv9 h-uheence a 1.0-N force. If they are moved to a new separat9) heuvuo7- uhion of 8.0 cm, what is the electric force between them?
A. $4.0 \; N$
B. $16 \; N$
C. $1/4 \; N$
D. $1/16 \; N$