The one event that eventually
had one of the major impacts on the influence of the advancement of airplanes
was the World War I. To cite for example, starting in October 1911, Italy
started to use aircraft for military purposes. Within a month, they realized
that they could bomb enemy positions using airplanes, hence changing the direction
of the airplane industry forever.
Therefore the answer among
the choice is:
increased
industrial efforts for world war i
