Which sentence from the article shows El Salvador's MAIN problem?
A
The government offers free education to children up to the ninth grade, but many families cannot afford the cost of supplies and transportation.
B
About 2 million Salvadorans live in the United States and send money home to El Salvador.
C
El Salvador's democratic government has added manufacturing jobs — but faces the challenges of poverty, crime and natural disasters.
D
Coffee, sugar, corn, rice, shrimp and beef are the main agricultural products in El Salvador.
