The year 1917 was important for the Wright Brothers because their first successful flight occurred.
their patent expired.
they began to work for the army.
they began to work for the British Air Force.

your answer is B their patent expired :) hope this helps

Explanation:

the triple alliance. germany and austria-hungary were already allies by 1879 when, worried about a threat from russia, they formed the dual alliance. italy joined the group in 1882. there was a concern about a possible attack from france and the alliance needed powerful friends to defend it.

the foundation of greek city-states: following the fall of the mycenaean civilization in the 10th century bc, the area surrounding the empire went through its own mini dark ages. answer and explanation