Among the four given aldotetroses, which are C2 epimers, and which are enantiomers?

• A. C-2 epimers: D-erythrose and L-erythrose; D-threose and L-threoseEnantiomers: D-erythrose and D-threose; L-erythrose and L-threose
• B. C-2 epimers: D-erythrose and L-threose; L-erythrose and D-threoseEnantiomers: D-erythrose and L-erythrose; D-threose and L-threose
• C. C-2 epimers: D-erythrose and D-threose; L-erythrose and L-threoseEnantiomers: D-erythrose and L-erythrose; D-threose and L-threose
• D. C-2 epimers: D-erythrose and D-threose; L-erythrose and L-threoseEnantiomers: D-erythrose and L-threose; D-threose and L-erythrose

Answer: (C)