Final answer:
The launch angle that maximizes the range of a projectile on level ground is 45° (c).
Step-by-step explanation:
To maximize the range of a projectile launched on level ground, the launch angle should be 45° (c). This angle provides the optimal balance between horizontal and vertical velocity components, allowing the projectile to travel the farthest distance.
At launch angles less than 45°, the range decreases because the vertical velocity component becomes dominant, causing the projectile to spend more time in the air and less time traveling horizontally. At launch angles greater than 45°, the horizontal velocity component decreases, resulting in a shorter range.
Therefore, the launch angle that maximizes the range of a projectile on level ground is 45° (c)