*
A cold dry air mass would be classified as
CP
mP
Ост
h
mt

It would be mP.

Explanation:

In winter an artic air mass (very cold and dry air) can move over the ocean, picking up some warmth and moisture from the warmer ocean and becoming a maritime polar air mass (mP)- one that is still fairly cold but contains moisture (I hope this helps you!)

it sounds like either a or c

the proximity of water was an advantage to western europe and its culture was able to flourish as a result. trade and travel by sea were easier and safer in historical times.

1. there are no mountains to protect it from the sea

2. and its has wet cool summers and wet, mild winters.