What does justin need to do to head north? turn left onto maple st. make a sharp turn onto elm st. make a u-turn on oak st. turn right onto pine st.

Turn Right on Pine St.

Explanation:

He is currently heading West, and if the image attached is what you are referring to, then you can see going West is going up Oak Street.

So if West is going up Oak street, then going to the right would be north.

The orientation of the map would be:

             W

S                            N

              E

So turning right onto Pine Street would take him north-bound.

the answer would be b).