19. If a muon with a lifetime of 2.0 μs is traveling at a speed of 0.60c relative to Earth, how far does it travel during its lifetime as observed by a stationary observer on Earth? (Gravitational effects can be neglected.) (A) 2.9 × 10² m (B) 3.6 × 10² m (C) 4.5 × 10² m (D) 6.0 × 10² m (E) 9.0 × 10³ m