What problem would a 2 front war cause the central powers

For the first time German units were larger than the British and French combined. However eight months later, the Central Powers lost due to a failure in tactics, a new enemy entering towards the end of the war and being starved into submission by their enemies

Explanation:

under god i have placed my chiest strentgh and the safe guard to my loyal subjects

the graph shows the spread of railways in the 1800s.

based on the graph, the conclusion that can be drawn about germany is answer d)   by 1880, germany had more rail lines than great britain and russia.