In the marathon race athletes have to cover a distance of how many miles ?

In the marathon race athletes have to cover a distance of how many miles ?

A. 15
B. 19
C. 26
D. 28

The marathon is a long-distance race with an official distance of 42.195 kilometres (approximately 26 miles 385 yards), usually run as a road race. The event was instituted in commemoration of the fabled run of the Greek soldier Pheidippides, a messenger from the Battle of Marathon to Athens, who reported the victory.