Which One to Hire?

You are a game designer for Rovio Entertainment, the company that makes Angry Birds. The human resources department wants your input. They want to hire a programmer to build the physics engine for their newest game. Here are the demo videos from the top four applicants. Which applicant(s) would you recommend for hire?

• Use LoggerPro and your knowledge of physics to justify your recommendation
• Applicant files A, B, C, and D below can be downloaded

(thanks to Frank Noschese for this activity)