Correct choice is (c) Reproducible and linear
Explanation: The choice of organic phase depends on the following factors
* Solvent polarity
* Cost
* ease of recovery
* fire and fume hazards
* specific inhibitory effects
The response should be accurate, precise, reproducible and linear over the useful analytical range, without dilution or concentration. It should also be free from electrical noise. This is a feature that a biosensor should possess.