All of the following proved to be a challenge for US forces in the Pacific Theater EXCEPT
A. High casualty rates
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B. Maintaining a supply line over a vast distance
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C. Harsh conditions due to the tropical climate
D. The Japanese had successfully broken every Allied encoded communication

the answer here would be

this scroll was the first major biblical manuscript of great antiquity ever to be recovered. the qumran isaiah scroll predated the oldest hebrew text preserved in the masoretic hebrew bible by a millennium.

on august 14, 1935, the social security act established a system of old-age benefits for workers, benefits for victims of industrial accidents, unemployment insurance, aid for dependent mothers and children, the blind, and the physically handicapped.