Which most accurately describes a problem faced by the Russian army on the eastern front during World War I?

Ottoman forces, Russia’s ally, were ineffective against British forces.
A lack of able-bodied soldiers left Russia at a numeric disadvantage.
Poor transportation networks left troops ill-equipped on the front lines.
Russia was simultaneously attacked by Iran and Austria-Hungary.
C?

To determine the most accurate description of a problem faced by the Russian army on the eastern front during World War I, let's analyze each option:

- Option A: Ottoman forces, Russia's ally, were ineffective against British forces.
This option does not accurately describe a problem faced by the Russian army on the eastern front during World War I. It focuses on the effectiveness of Ottoman forces against British forces, which is not directly related to the Russian army's challenges on the eastern front.

- Option B: A lack of able-bodied soldiers left Russia at a numeric disadvantage.
This option accurately describes a problem faced by the Russian army. During World War I, Russia faced challenges due to a shortage of able-bodied soldiers. This factor did place Russia at a numerical disadvantage compared to its opponents.

- Option C: Poor transportation networks left troops ill-equipped on the front lines.
This option also accurately describes a problem faced by the Russian army. The lack of an efficient transportation network in Russia during World War I impacted the army's ability to supply troops adequately, resulting in them being ill-equipped on the front lines.

- Option D: Russia was simultaneously attacked by Iran and Austria-Hungary.
This option is incorrect. While Russia faced multiple challenges on multiple fronts during World War I, it was not attacked by Iran during this time. The primary focus on the eastern front was against Austria-Hungary.

Considering the above analysis, both options B and C accurately describe problems faced by the Russian army on the eastern front during World War I. However, option C, which states that poor transportation networks left troops ill-equipped on the front lines, is the most accurate explanation. Therefore, option C would be the correct answer.