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

## Step 1<br />The problem is a multiple-choice question about the historical significance of the year 1917 for the Wright Brothers. The options are:<br />- their first successful flight occurred<br />- their patent expired<br />- they began to work for the army<br />- they began to work for the British Air Force<br /><br />## Step 2<br />The correct answer is "they began to work for the army". This is because in 1917, the Wright Brothers began to work for the U.S. Army, which was a significant milestone in their careers.<br /><br />## Step 3<br />The other options are incorrect because:<br />- Their first successful flight occurred in 1903, not 1917.<br />- Their patent did not expire in 1917.<br />- They did not begin to work for the British Air Force in 1917.