what is meant by the description “antiparallel” regarding the strands that make up dna?

A) The twisting nature of DNA creates nonparallel strands.
B) The 5′ to 3′ direction of one strand runs counter to the to direction of the other strand.
C) Base pairings create unequal spacing between the two DNA strands.
D) One strand contains only purines and the other contains only pyrimidines.