(A) That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior requires extensive experience and caution has been proven both by the near-death experiences of amateur cave divers and by the massive costs of the rescue operations to save those amateur cave divers.
-->Incorrect . Subject verb agreement error - for statement format "..exploration and subsequent mapping.. requires.." - 'require' should be used instead of 'requires'
(B) That the exploration
...
-->Incorrect . Subject verb agreement error - for statement format "..exploration and subsequent mapping.. requires.." - 'require' should be used instead of 'requires'
(B) That the exploration
...
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