The molecule shown below contains only one asymmetric center but has four stereoisomers. Explain why.

• A. The molecule contains two stereocenters - a chiral center and a trigonal center. The molecule can also exhibit cis-trans isomerism.
• B. The chiral center alone produces two R enantiomers and two S enantiomers.
• C. The molecule contains two stereocenters - a chiral center and a trigonal center. The molecule produces a pair of enantiomers and a pair of constitutional isomers.
• D. The chiral center alone produces a pair of enantiomers and a pair of diastereomers.

Answer: (A)