What strategy did the Allies use to counter the Luftwaffe's air superiority?

The strategy of combined air operations was crucial for the Allies in countering the Luftwaffe's air superiority during World War II. This approach centered on the integration of various military branches, utilizing both ground and naval air forces in a coordinated manner to achieve air dominance.

By deploying fighter aircraft to gain control of the skies, the Allies were able to protect their bombers and ensure safe passage for troops and supplies. Operations like the Battle of Britain exemplified this strategy, where effective coordination between RAF fighters and the overall air campaign disrupted the Luftwaffe's attacks and maintained air superiority. This cooperation extended to joint missions that combined the efforts of air force units with the strategic objectives of land forces, enhancing overall military effectiveness.

In contrast, the other strategies listed do not address the specific need to regain and maintain air superiority over the enemy. Submarine warfare and naval superiority focus more on maritime operations rather than aerial dominance, while trench warfare is associated with land battles of World War I rather than the strategic air operations necessary for countering the Luftwaffe during World War II.