The right answer is:
"Yo trabajo en mi tarea".
That´s because is talking in first person.
"Trabajas" is for "you".
"Trabajan is for "they"
and "Trabajamos" is for "we"
In my class, the clock is on the blackboard. Students' desks are in front of the teacher's desk. The bin always next to the door. The teacher in front of the students. My companions and I attentive in all classes.
It's A because -emos is the nosotros form so it's talking about we
