What is the least hourly wage that Bob's employer may pay him, given that he works in Massachusetts with a minimum wage of $8.00 per hour?

In Massachusetts, the minimum wage is established at $8.00 per hour. This means that any employer is legally required to pay their employees at least this amount for their labor. Therefore, the least hourly wage that Bob's employer can pay him is indeed the state minimum wage of $8.00.

Paying less than the minimum wage, such as $7.50 or $7.25, would not comply with Massachusetts labor laws and could result in legal repercussions for the employer. The option suggesting that an employer might choose any of the amounts listed disregards the strict adherence to minimum wage laws, which are designed to protect workers' rights to fair compensation. Consequently, Bob's employer is obligated to compensate him at least at the minimum wage rate of $8.00 per hour.