In the reaction, `R--=-Roverset(Birch)underset(reduction)rarr` source of two H atoms which are added to alkyne to give trans-alk

In the reaction, `R--=-Roverset(Birch)underset(reduction)rarr`

source of two H atoms which are added to alkyne to give trans-alkene is:
A. (a) `NH_3`
B. (b) `EtOH`
C. (c) `Et-NH_2`
D. (d) Both (a) and (c)

In the reaction, `R--=-Roverset(Birch)underset(reduction)rarr` source of two H atoms which are added to alkyne to give trans-alkene is: