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.

i would have to know what the audios say as well with the question. : /

if your asking for what that says, it is

which of these words is an

but i don't know what sentence your asking for the adjective from.