Two Weather Stations Lie Along a Latitude Line

Two weather stations lie along a latitude line. The eastern station records a pressure of 1021mb, the western station records 1015mb. The 1020 isobar is closest to which station?

A) Western because the isobar is closest to 1015
B) Western because the isobar is closest to 1021
C) Eastern because the isobar is closest to 1015
D) Eastern because the isobar is closest to 1021