Which Best Describes the Aleutian Low and the Icelandic Low

Multiple Choice

Which best describes the Aleutian low and the Icelandic low?

A) These are dominant in winter and weaken or disappear in summer.
B) These are dominant in summer and weaken or disappear in winter.
C) These are dominant in spring and fall and weaken or disappear in summer and winter.
D) These are dominant year-round,but tend to be strongest in summer.