It seems like you're looking for a response that relates to the effects of increased business costs on the workforce or the economy, possibly in a historical context. However, the options provided don't directly tie to the initial statement about businesses' costs increasing to pay for machinery.
If the context is about the workforce or the impact of industrialization, a more fitting response might be that "They started working in factories," as this ties to the historical shift in labor due to industrialization and the adoption of machinery.
Would you like to provide more context or clarify the question further?