Which of the Following Features Are the Two Important Characteristics

Which of the following features are the two important characteristics of High-latitude climates (Polar and sub-Polar) ?

A) low temperatures and sub 25 degrees heat in the summer
B) extreme seasonal variability and polar snow storms dumping over 17 inches of snow every month
C) low average temperatures and extreme seasonal variability.
D) few daylight hours both in the summer and winter
E) summer rain and winter dry periods