Which of these statements is the MOST accurate?

Aircraft became very sophisticated in the decade between the first Wright Brothers flight in $1903$ and the outbreak of the First World War.

Roland Garros achieved fame in April $1915$ by being the first pilot to be shot down by an enemy aviator in the war.

Neither side was ever able to come up with a solution to the problem of a forward$-$firing machine gun damaging a plane$$s propellor.

Aircraft first proved their value in the war at the Battle of the Marne in $1914$ when a French scout successfully spotted the movements of the German Army.