Which of the following can lower the convulsion threshold (at therapeutic doses).. Phenytoin - Epanutin

Which of the following can lower the convulsion threshold (at therapeutic doses):
A) Carbamazepine (Tegretol)
B) Propanolol (Inderal)
C) Amitryptiline (Tryptizol)
D) Phenytoin (Epanutin)***