The best representation of the target market for a low-budget, door-to-door based vacuum sales business would be:
d. local domestic workers and stay-at-home spouses who do housework.
This option focuses on specific demographics that are more likely to have a need for vacuum cleaners, making it a more strategic choice than the broader options. It identifies individuals who manage household cleaning regularly and are likely to be decision-makers when it comes to purchasing a vacuum.