Ribosomes Use L Amino Acids to Synthesize Proteins $\alpha$ That Can Be Related to the Configuration of Groups

Ribosomes use L amino acids to synthesize proteins.These amino acids are called "L" because

A) they are chiral.
B) they turn polarized light to the left.
C) they have a configuration of groups around the C _$\alpha$ that can be related to the configuration of groups around the asymmetric carbon in L-glyceraldehyde.
D) they are all (S) -amino acids.
E) they are all (R) -amino acids.