Which of the Following Is $\underline { \text { not } }$

Multiple Choice

Which of the following is $\underline { \text { not } }$ an adaptation to living in periglacial regions?

A) buildings placed directly on frozen, hard surfaces
B) water and sewage lines in elevated trays above the ground
C) raised oil pipelines above the frozen ground
D) careful maintenance of rail tracks and roadbeds in the summer