Which phrase best completes the diagram?

A box connected with 3 other boxes in second row by unidirectional arrows. Text that reads: Box 1 Physical geography of China. Box 2 Has large coal reserves. Box 3 Borders the South China Sea. Box 4 ?.
A.
Is separated from India by the Himalayas
B.
Has a climate that is hot and humid for almost the entire year
C.
Is mostly covered in heavily forested plateaus
D.
Is forced to buy nearly all its oil from other countries