Hydrogen Bonding Between the Carbonyl Group of an Amino Acid $\beta$

Hydrogen bonding between the carbonyl group of an amino acid on one strand with the amino group of the neighboring strand leads to ______.

A) parallel $\beta$ -pleated sheets
B) antiparallel $\beta$ -pleated sheets
C) an $\alpha$ -helix
D) a $\beta$ -helix
E) either A or B