The phrase "a viable choice when" is correct and usable in written English.
It can be used to indicate a suitable option or alternative in a specific situation or context.
Example: "Choosing renewable energy sources is a viable choice when considering the long-term sustainability of our planet."
Alternatives: "a suitable option when" or "a practical choice when".
Facebook, Twitter, Google+ and LinkedIn are all viable choices when it comes to your social profile - the trick is finding the right one (or more) on which to showcase your microsite.
We have clarified in which situations such a guide system is a viable choice and when the parabolic feeder is necessary in terms of neutron transport.
Poisons are not a viable choice because when not used properly it can be dangerous to humans and non target animals including pets.
"The events of the last few days prove that there is a viable choice in Syria when it comes to fighting extremism," Shahbandar said.
In some areas swidden remains important simply because intensification is not a viable choice, for example when population densities and/or food market demands are low.
This is further aggravated by the valuing of the creation of children as a necessary component of becoming a parent and the subsequent perception of adoption as a viable choice only for when all else has failed (Bartholet /1999 1994; Brakman and Scholz 2006).
When the cord cutting movement first started become a viable choice, consumers quickly found themselves without access to key sporting events.
When Lerner and Loewe turned "Pygmalion" into a musical in 1956, that was hardly a viable choice.
Its major advantage is to allow for greater computational tractability when dealing with high dimensional issues, where two-stage procedures are no more a viable choice.
Football for youngsters may present many more risks than alternative activities, but when conducted in a manner that minimizes unnecessary risks, it should be consider a viable choice.
