Question

what country joined with the central powers after world war i had begun? egypt italy serbia bulgaria

Explanation:

During World War I, the Central Powers initially included Germany, Austria - Hungary, and the Ottoman Empire. After the war began, Bulgaria joined the Central Powers in 1915. Egypt was a British protectorate during WWI and not part of the Central Powers. Italy was initially part of the Triple Alliance with Germany and Austria - Hungary but switched to the Allied side at the start of the war. Serbia was part of the Allied forces, fighting against the Central Powers.

Answer:

D. Bulgaria