Which Amino Acids Are Converted to α-Ketoglutarate

Which amino acids are converted to α-ketoglutarate?

1. glycine
2. glutamate
3. histidine
4. arginine
5. proline

A) 1, 3, and 5
B) 2, 3, and 4
C) 2, 3, and 5
D) 2, 3, 4, and 5
E) 3, 4, and 5