[单选题]
Can electric field linef8n9js*,x g7 fskigd *.bv- mls inter;bytb) sep7q+ sect in free space?
A. Yes, but only at the midpoint between two equal like charges.
B. Yes, but only at the midpoint between a positive and a negative charge.
C. Yes, but only at the centroid of an equilateral triangle with like charges at each corner.
D. No.