The correct statement is that after the Allied forces had invaded the Italian land in the year 1943 the Italian forces had quickly surrendered. So, the correct option is C.
The Allied forces included the countries like Great Britain, the US, China, France and Soviet Union members while they attacked on the Italian mainland.
Hence, the correct option is C that the Allied forces attacks on the Italian mainland in the year 1943 resulted in the surrender by Italy and loss of the power of control from the hands of Benito Mussolini.
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