[单选题]
Two point charges, initially 2.0 cm apart, xzj,l yvs.94-x * fdy-g dzz9r5m 5rmtexperience a 1.0-N foro4b,4se pcr r4c4gy:cce. If they are moved to a new separation of 8.0 cm, s pb4r4 g4c:c4r,ceyowhat is the electric force between them?
A. $4.0 \; N$
B. $16 \; N$
C. $1/4 \; N$
D. $1/16 \; N$
