$(1)$ CBP runs two cargo pre$-$inspection facilities, one in Mexico and another in the United States.

$(2)$ In contrast, the U$.$S$.$ facility is staffed by Mexican Officers who check air cargo destined for Mexico.

$(3)$ For both facilities, screening cargo before leaving the exporting country is the core of the cargo preinspection facility program.

$(4)$ CBP Officers at the Mefico facility handle trucks hauling certain produce into the United States.

A$)1-3-2-4$

B$)2-4-1-3$

C$)1-4-2-3$

D$)$ no change to the sentence order is necessary