Which of the following statements best describes New Zealand's physical landscape?
a. the South Island is predominantly flat, while the North Island is covered mostly with elevated plains
b. New Zealand's terrain is mostly mountainous, with gentle plains sloping down from the mountains on both sides
c. Rugged mountains form the backbone of the North Island, while the South Island is predominantly flat
d. The physical landscape of each island consists mostly of flat land that is below sea level B?