Robinson is a botanist whose dream is to reestablish an authentic pre-human piece of Hawaii, a place now awash with introduced species of plants and animals.
A. who has the dream to reestablish an authentic pre-human piece of Hawaii,
B. whose dream it is to reestablish an authentic pre-human piece of Hawaii,
C. who it is his dream to reestablish an authentic pre-human piece of Hawaii,
D. that is dreaming to reestablish an authentic pre-human piece of Hawaii,
E. whose dream is to reestablish an authentic pre-human piece of Hawaii,