The correct answer is D) Both A and B. Northers are strong, cold winds that blow from the north during the winter months in the Gulf of Mexico. These Northers are typically associated with the passage of cyclonic weather systems (answer A) and high pressure systems or anticyclones (answer B) that move across the region. The strong pressure gradients between the low pressure cyclone and the high pressure anticyclone drive the gusty northerly winds known as Northers. The other answer choices are incorrect because a high pressure system alone (answer C) would not produce the strong, cold winds, and Northers are not exclusively associated with just one type of weather system.