Abortive means failing to achieve the intended result, or unsuccessful. An abortive attempt is one that does not succeed and is stopped before it is complete.
Among the given options, Unsuccessful carries this exact sense of failure.
Fruitful means productive, which is actually opposite in meaning. Familiar means well known, and Consuming means using up a lot of resources or time. Neither matches abortive.
So the correct option is C, Unsuccessful.