A particle passes from one end of a laboratory to the other in 4.2x10⁻⁸ seconds as observed by a scientist who is stationary with respect to the lab.
That scientist measures the lab to be 10 m long. In the frame of the particle, the length of the lab is measured to be closest to:
A) 10 m.
B) 8 m
C) 6 m
D) 12.5 m