Yo conozco a Eric. A.
Yo la conozco.
B.
Yo los conozco.
C.
Yo lo conozco.
D.
Yo te conozco.

Yo lo conozco.

Since he is a male you wouldn't say Yo la conozco. Since its one person you could not say los conozco. Yo te conozco would not work either so this is the best option.

travel to mexico,

you would sell things that you don't use anymore.

their's 2 things you could put in your spanish assignment.