The Opium Wars were a series of wars between Chine and Great Britain. It started when Chine started to refuse the shipments of Opium. The war was a fail for China, this means that answer A, C, and D are wrong. The only answer left is B. Please contact me if you want more information on the opium war.
Hope this Helps! :)
In the eastern part of the confederacy, the Army of the Protomac met with mixed success. The Union Army failed to capture Richmond and won at Antietam only because the Confederates withdrew from the field first. In the western part of the Confederacy, the Army of the West won the Battle of Shiloh, and the Union navy captured New Orleans and Memphis.