What notable feature characterized the American Soldier's household?

The correct answer highlights the significant role of family structure in the American Soldier's household during historical contexts. In many cases, particularly in earlier periods of American history, it was common for soldiers to have their mothers living with them. This arrangement not only emphasized familial bonds but also provided support systems for the soldier, especially during times of conflict or personal hardship. The presence of a mother often implied a nurturing environment, where she could assist with domestic responsibilities or help care for any children the soldier might have. Thus, this answer reflects the importance of family in the soldier's life.

Given this context, the other options do not accurately capture the typical family dynamics seen in the households of American soldiers. Living alone or having no dependents would suggest a lack of familial support and connection, which was less common historically. Additionally, having in-laws reside with the soldier would indicate a specific household arrangement that doesn't reflect the broader, more traditional family dynamics characterized by maternal presence.