Question

how did airplane use change as world war i progressed?
○ military forces became dependent exclusively on airplanes for fighting battles.
○ airplanes became involved in active battle.
○ fewer civilians took airplanes because of german threats.
○ airplane use declined, as there were insufficient materials to build new planes.

Explanation:

• Analyze Option 1: Military forces didn't rely exclusively on airplanes in WWI (other weapons/strategies existed), so this is incorrect.
• Analyze Option 2: Initially, planes in WWI were for reconnaissance, but as the war progressed, they were adapted for active battle (e.g., dogfights, bombing), so this matches the change.
• Analyze Option 3: Civilian air travel was minimal in WWI, and the focus was on military use, so this is not relevant to the main change in airplane use during the war.
• Analyze Option 4: Airplane use increased for military purposes as the war progressed (more planes were built/used for combat), so this is incorrect.

Answer:

B. Airplanes became involved in active battle.