B.
The icy, winter weather caused a power outage last winter.
A.
I love to go to the beach on long, August days.
B.
The icy, winter weather caused a power outage last winter.
C.
The frightening, fierce winds toppled trees and power lines.
D.
Five, large deer stood in the field behind our ranch.
The icy, winter weather caused a power outage last winter.
C.
The frightening, fierce winds toppled trees and power lines.
A.
I love to go to the beach on long, August days.
C.
The frightening, fierce winds toppled trees and power lines.
In option A, the sentence is "I love to go to the beach on long, August days." Here, "long" and "August" are coordinate adjectives describing the noun "days." They can be rearranged as "August long days" without changing the meaning. Therefore, the use of the comma between "long" and "August" is correct.
In option B, the sentence is "The icy, winter weather caused a power outage last winter." In this case, "icy" and "winter" are also coordinate adjectives describing the noun "weather." They can be rearranged as "winter icy weather" without altering the meaning. Therefore, the use of the comma between "icy" and "winter" is correct.
I mistakenly marked option C as correct earlier. I apologize for that error.