16. Consider two observers A and B sit on two trains Tₐ and TB, respectively. These two trains have the same proper length. If Tₐ stays in a station and TB moves with a velocity v with respect to the station. When they overlap in the station, which one of the following statements is correct? (A) The observer A finds that Tₐ is shorter than TB, but the observer B finds that TB is shorter than Tₐ. (B) The observer A finds that TB is shorter than Tₐ, but the observer B finds that Tₐ is shorter than TB. (C) Both A and B find that Tₐ is shorter than TB. (D) Both A and B find that TB is shorter than Tₐ. (E) Both A and B find that TB and Tₐ have the same length.