What aspect of work rights does the Arizona Constitution ensure?

The correct answer highlights an important provision in the Arizona Constitution regarding the protection of workers' rights, specifically focusing on the principle of non-discrimination based on union membership. This aspect is significant because it ensures that individuals cannot be treated unfairly or unjustly in the workplace simply due to their involvement or non-involvement with a labor union.

This principle supports the idea of a fair labor system, where workers can choose to join or not join a union without the fear of retaliation or discrimination from their employer. Such protections are vital in promoting a balanced power dynamic within the workplace, encouraging workers to advocate for their rights without risking their livelihoods.

The other options present misconstrued or overly restrictive interpretations of worker rights. Requiring union membership is contrary to the right of workers to make personal employment choices. The notion that workers can be fired at any time without cause contradicts many labor protections that exist, ensuring job security under certain circumstances. Finally, suggesting that all jobs require licenses doesn't universally apply, as numerous occupations do not mandate a license at the state level. Thus, the emphasis on non-discrimination based on union membership stands out as the correct representation of the Arizona Constitution's commitments to workers' rights.