Alkynes are reduced to trans alkenes by a process called

a. dissolving metal reduction.
b. The reaction uses sodium or lithium metal as the reducing agent and liquid ammonia as the solvent.
c. The method is specific in the formation of trans alkenes from alkynes.
d. The method involves two successive transfers of single electrons from the alkali metal to the triple bond, with abstraction of protons from the ammonia solvent.