Analyze the map below and answer the question that follows.
A color-coded thematic map of Southeast Asia. Climate regions are labeled 1, 2, 3, and 4. 1 is in northern Myanmar and Laos. 2 is in Cambodia, Southern Myanmar, Thailand, and islands of Indonesia. 3 is the middle of island of Malaysia and Papua New Guinea. 4 is majority of Southeast Asia including the islands of Singapore, Indonesia, the Philippines, and mainland Malaysia and Vietnam.

The humid subtropical climate region is labeled with which number on the map above?
A.
1
B.
2
C.
3
D.
4