Earlier quoted context omitted.
I don't mean to make assumptions about your life or your conditions, but in scenario A you describe a reality where there are a meaningful number of people who would be content to sell their labor for less than $7.25 per hour. I do not find this believable, given how little that amount is in today's dollars. At the point that you're okay with working for, say, $5/hour, why work at all? What lifestyle permits that as…
In the case of most US states, I think it's fair to say that the minimum wage is moot. As you say, hardly anyone would consider working for less than that anyway. But why take away their freedom to do so?
It's nit really "minimum" if companies can pay less legally.