8. As a result, these could be seen as being the two most _____ options.liveableviableenviableinvaluable

To determine the correct word to fill in the blank in the sentence "As a result, these could be seen as being the two most _____ options," we should analyze the meanings of the given options:

1. Liveable: Refers to something suitable for living or life. While this could make sense, the context of the sentence suggests a more evaluative term.

2. Viable: This term means capable of working successfully or feasible. Using "viable" suggests that the options can be successfully executed or implemented.

3. Enviable: This implies that the options are desirable or coveted by others. Although this can fit, it doesn't directly convey a sense of practicality or effectiveness.

4. Invaluable: This indicates something extremely useful or indispensable. While important, it doesn't fit as well with "options" in terms of comparing them.

Conclusion:

The most appropriate word in this context is "viable," as it suggests that the options are practical and successful choices. Therefore, the completed sentence reads: "As a result, these could be seen as being the two most viable options."