Among the northern andean countries strongly involved in the illegal coca and drug trade, is now the predominant coca producer.
a. ecuador
b. bolivia
c. colombia
d. peru

Among the northern Andean countries strongly involved in the illegal coca and drug trade, "Peru" is now the predominant coca producer, although it should be noted that the data we have for this is not necessarily up to date. 

The answer i think is d

Tropical climate is experienced in the nothern countries of south america