To raise money, how did the sisters go collecting for three months?

The correct choice highlights the approach taken by the sisters, who traveled to mining and railroad camps to collect funds. This method was strategic, as these locations were often bustling with people who could provide charitable contributions. It reflects the economic landscape of the time when mining and railroad work was prevalent in the region, giving rise to a population that might be willing to help those in need. By engaging directly with workers at these camps, the sisters could raise awareness of their cause while also requesting support in a more targeted setting.