What port city handles the largest amount of international sea trade in the united states?
a.
galveston
c.
el paso
b.
houston
d.
corpus christi

Houston

Explanation:

The port of Houston is 2nd in the United States in terms of tonnage, and is located in the 5th largest city of the United States. The South Louisiana port handled a slightly more tonnage than Houston, but it's not located in a city (and is not in Texas, where all your choices for answer are).

Galveston port is minimal compared to Houston (about 5% of the tonnage).

Corpus Christi is also an important port but handles about half of what Houston does.

El Paso is an inland city, it has no sea port.

Houston is the answer to your question