One dark night the power goes off at your house. Would you rather have a candle or a flashlight? Explain

Flashlight

Explanation:

The candle can accidentally be extinguished, but not the flashlight. The flashlight may also serve as a weapon, if needed. Candles are prone to multiple fire hazards, so a flashlight is my choice.

The one that serves to screen and select the members of society for the work they will do is: C. education

When you are applying for a job as an accountant, for example, the Human resource will automatically screen out those without any accounting education because they tend to be less competent in doing the job. 
Basically, education background guarantees that you at least had received basic training and information regarding that specific job.