Which of the following best describes the expansion in total railway line kilometers by 1850 in countries that possessed zero kilometers of railroad lines in 1830 ? A) Austria-Hungary had the largest expansion. (C) Italy had the largest expansion. expansion. Russia had the largest expansion.

By 1850, several countries that initially had no railway lines in 1830 experienced significant railway expansions. Among the options provided: - **Austria-Hungary**: Began developing its railway network in the 1830s and saw considerable growth by 1850, but it wasn't the largest. - **Italy**: Before its unification in the 1860s, the Italian peninsula was fragmented into various states, each developing their railways independently. While there was growth, it wasn't the most substantial compared to larger empires. - **Russia**: Initiated its railway development relatively late but rapidly expanded its network by 1850 to facilitate movement across its vast territories. By 1850, Russia had established one of the largest railway networks in the world, significantly more extensive than Austria-Hungary and Italy at that time. **Therefore, the best description is:** **Russia had the largest expansion.**