I think it would be command hope this helps
"<span>It led to a large number of causalities on both sides" would be the best option from the list, since the war still dragged on although now with far more men involved, meaning more deaths.</span>
TO THE PACIFIC, NOT 100% SURE THO
Now I'm not 100% sure here but C is your best bet
The answer would be Joseph Stalin.
Hope this helps!
- Juju
