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.(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.
Use of 'requires' to depict singular verb for the phenomenon of 'the exploration and mapping of underwater cave system's Byzantine interior' is correct; But, the use of 'that' in the beginning is inappropriate since no clear antecedent is attributed(B)
That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior
require extensive experience and caution has been proven just as much by the near-death experiences of amateur cave divers as by the massive costs of the rescue operations to save those amateur cave divers.
Use of 'require' to depict singular verb for the phenomenon of 'the exploration and mapping of underwater cave system's Byzantine interior' is incorrect; Also, the use of 'that' in the beginning is inappropriate since no clear antecedent is attributed(C)
Proven just as much by the near-death experiences of amateur cave divers as well as by the massive costs of the rescue operations to save those amateur cave divers,
the exploration and subsequent mapping of the underwater cave system’s interior requires extensive experience and caution.
Inappropriate modifier usage -- 'the exploration and mapping' has not been proven, rather it is the requirement of experience and caution -- which has been proven by near death experience and rescue operations(D) The exploration and subsequent mapping of the underwater cave system’s interior
requires extensive experience and caution, as has been proven
not only by the near-death experiences of amateur cave divers
but also by the massive costs of the rescue operations to save them.
CORRECT meaning evident in that , it clearly depicts that requirement of extensive experience and caution has been proven by near death experiences and rescue operations. Also, correct parallel structure for usage of 'not only..but also'(E) The process of exploring and mapping the underwater cave system’s interior
require extensive experience and caution, proven
both by the near-death experiences of amateur cave divers
as much as by the massive costs of the rescue operations to save them.
Use of 'require' to depict singular verb for the phenomenon of 'the exploration and mapping of underwater cave system's Byzantine interior' is correct. Simultaneously, use of 'both' and 'as much as' is redundantMeaning is the key..
(D) is the CORRECT answerHope this helps..