[单选题]
Electric dipoles always mmch(,)5zx11:bx.au dmzmybd jya9,consist obg8hhb2r jxle cs6e4b7-q:/ ff two charges that are
A. equal in magnitude; opposite in sign.
B. equal in magnitude; both are negative.
C. equal in magnitude; both are positive.
D. unequal in magnitude; opposite in sign.
