Along Which Path Is the Distance to the Epicentre Measured

Along which path is the distance to the epicentre measured?

A) the distance around the outside circumference of the Earth between your station and the epicentre following a great circle route (like a line of longitude)
B) the shortest distance through the Earth between the earthquake and your station (like the chord across a circle)
C) the shortest great circle route that passes through the north pole
D) the longest great circle route that passes through your station