Why Are Remittances Like an "Import" Industry to Mexico

Why are remittances like an "import" industry to Mexico?

A) The Mexicans who live in the United States export goods and services to Mexico, and these goods and services become Mexico's imports.
B) The United States' largest trading partner is Mexico.
C) Mexican workers from outside Mexico send money back to all parts of Mexico, and this becomes the largest inflow of capital into Mexico.
D) The United States exports the largest number of goods and services to Mexico.