Solve these 2 questions on sentence correction with explanation :
Question 1: When a passenger aircraft crashed in the jungles near the village of Triskiti, local tribesmen collected pieces of the broken plane before they could be carefully examined where they had fallen, unintentionally thwarting the efforts of investigators that already were made difficult by the remoteness of the crash site.
A. unintentionally thwarting the efforts of investigators that already were made difficult by the remoteness of
B. unintentionally thwarting the efforts of investigators, which already were made difficult by the remoteness of
C. unintentionally thwarting the efforts of investigators, that had already been made difficult by the remoteness of
D. unintentionally thwarting the efforts of investigators, and already made difficult by the remoteness of
E. unintentionally thwarting the efforts of investigators, and already made difficult by the remote location of
Question 2 : New genetic evidence – together with recent studies of elephants’ skeletons, tusks, and other anatomical features – provide compelling support for classifying Africa’s forest elephants and its savanna elephants as separate species.
A. provide compelling support for classifying
B. provide compelling support for the classification of
C. provides compelling support to the classification of
D. provides compelling support for classifying
E. provides compelling support to classify