Answer:
Hi!
The answer is option A, Italy.
Step-by-step explanation:
Italy decided to switch sides once the war began and refused to honor it's part in the Triple Alliance.
Italy declared war against Austria Hungary and left the triple alliance. Italy declared itself a neutral country when the war had started and they carefully reviewed the options from each side as they were looking for the side that would give the best gain. In 1915 Italy signed the Secret Treaty Of London committing itself to enter WWI on the side of the allies on April 26, 1915.