The Lifetime of a π⁺ Meson Normally Is 18 Nanoseconds

Multiple Choice

The lifetime of a π⁺ meson normally is 18 nanoseconds.In a large particle accelerator,scientists can create π⁺ mesons moving at speeds very close to the speed of light.What do the scientists observe when they measure the lifetime of a π⁺ meson that is created at very high speed?

A) The π⁺ meson lasts 18 nanoseconds.
B) The π⁺ meson lasts much more than 18 nanoseconds.
C) The π⁺ meson lasts much less than 18 nanoseconds.
D) The π⁺ meson no longer decays and remains as a stable particle.