Use the map below to answer this question:

What statement best decribes the structure at the end of the arrow?



a
A warm air mass moving over a warm air mass with winds going towards low pressure
b
A cold air mass is moving into a warm air mass with winds towards low pressure
c
A warm air mass in moving over a cold air mass with winds going towards the high pressure.
d
A cold air mass is moving into a warm air mass with winds going towards high pressure.