Threonine is converted into acetyl-CoA and pyruvate while proline is converted into $\alpha$ -ketoglutarate.Classify each of these amino acids.

A)threonine is ketogenic,proline is ketogenic
B)threonine is ketogenic and glucogenic,proline is ketogenic
C)threonine is ketogenic,proline is glucogenic
D)threonine is ketogenic and glucogenic,proline is glucogenic
E)none of the above