Final answer:
The correct statement regarding the configuration of amino acids is that all amino acids except proline are in trans configuration.
Step-by-step explanation:
The correct statement regarding the configuration of amino acids is d) All amino acids except proline are in trans configuration.
The configuration of amino acids is determined by the Cahn-Ingold-Prelog priority rules. The a-carbon of amino acids can have four different groups attached to it: amine group, carboxylic acid, hydrogen, and the alkyl side chain. Based on this configuration, all naturally occurring chiral amino acids are in the trans configuration, except proline which is an exception and is in the cis configuration.
Therefore, option d) All amino acids except proline are in trans configuration is correct.