What was the problem with the American Paratroopers on D-Day?

Heavy fog and German guns proved formidable challenges. The pilots were unable to drop the paratroopers precisely as planned. The 101st Division suffered great losses. Only one sixth of the men reached their destination points. The specific missions of the two airborne divisions were to block approaches into the vicinity of the amphibious landing at Utah Beach, to capture causeway exits off the beaches, and to establish crossings over the Douve River at Carentan to assist the U.S. V Corps in merging the two U.S. beachheads. American paratroopers suffered high casualties at Utah beach, some drowning under heavy equipment in flooded marshland, others shot out of the sky by Nazi snipers. The British and Canadian paratroopers met less resistance at Sword beach and quickly took two key bridges.

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the answer is definitley b!