1) Snakes molt their skins regularly, for the purpose of regenerating skin worn by ground contact and for eliminating parasites, like ticks and mites, and this made ancient people venerate the snake as a symbol of resilience and healing.
(A) for the purpose of regenerating skin worn by ground contact and for eliminating parasites, like ticks and mites, and this made ancient people venerate
(B) for regenerating skin worn by ground contact and for the purpose of eliminating parasites, such as ticks and mites, causing ancient people to venerate
(C) so as to regenerate skin worn by ground contact and to eliminate parasites, such as ticks and mites, and these shed snake skins made ancient people venerate
(D) in order to regenerate skin worn by ground contact and for the purpose of eliminating parasites, such as ticks and mites, with ancient people venerating
(A) for the purpose of regenerating skin worn by ground contact and for eliminating parasites, like ticks and mites, and this made ancient people venerate
(B) for regenerating skin worn by ground contact and for the purpose of eliminating parasites, such as ticks and mites, causing ancient people to venerate
(C) so as to regenerate skin worn by ground contact and to eliminate parasites, such as ticks and mites, and these shed snake skins made ancient people venerate
(D) in order to regenerate skin worn by ground contact and for the purpose of eliminating parasites, such as ticks and mites, with ancient people venerating
I think we're missing the 5th answer choice, though. 
