Final answer:
Javier is using b. contingent reward leadership style to motivate his work crews by providing rewards for early completion and high-quality work.
Step-by-step explanation:
Javier's behavior of giving rewards to his work crews when they complete a job early and exceed expectations is an example of b. contingent reward leadership style. In this leadership style, leaders motivate and reward their employees based on their performance and achievement of specific goals or targets.
By providing rewards for early completion and high-quality work, Javier is using a contingent reward leadership approach to incentivize his work crews.