How is F-35's performance in contested environments improved in Block 4?

The F-35's performance in contested environments is significantly enhanced in Block 4 by integrating improved electronic warfare capabilities and advanced situational awareness. These advancements enable the aircraft to better detect, identify, and respond to threats within a complex operational theater.

Enhanced electronic warfare systems allow the F-35 to engage in sophisticated jamming and deception, which disrupts enemy radar and communication systems. This capability is vital for operating effectively in environments where adversaries employ advanced sensors and weaponry. The integration of real-time data and intelligence supports pilots in making informed tactical decisions, thereby increasing operational effectiveness and survivability in hostile scenarios.

The other options do not contribute to performance enhancement in contested environments. For instance, increasing the aircraft size may have implications for durability, but it doesn't necessarily improve performance against threats. Limiting the operational range would restrict the aircraft’s effectiveness by reducing its capability to engage targets at a safe distance or provide support over long missions. Lastly, simplifying aircraft systems may compromise the advanced functionalities that are essential for contested operations, rather than enhancing the aircraft's capabilities in those scenarios.