He could not suggest a 'viable' alternative/option.
a 'viable' solution to the problem
Is she a 'viable' candidate?
(..) Just one angry shot!... ...for Furiosa. Hut! Crying shame. Another month... ...could've been a viable human! Was it a male? A-One Alpha Prime. Hey Rictus! You lost a baby brother! Perfect in every way. (..)2015 Mad Max: Fury Road