In Order to Replicate Both Strands, E. Coli

In order to replicate both strands, E. coli

A) displaces one of the strands and folds it back so both strands face in the same direction, so they can be synthesized at once.
B) synthesizes each strand in the opposite direction (one 5' → 3', one 3' → 5') , so they can be synthesized at once.
C) only synthesizes one strand at a time.