You Are Riding in a Spaceship That Has No Windows

Multiple Choice

You are riding in a spaceship that has no windows, radios, or other means for you to observe or measure what is outside. You wish to determine if the ship is stopped or moving at constant
Velocity. How can you do this?

A) You can determine if the ship is moving by determining the apparent velocity of light in the spaceship.
B) You can determine if the ship is moving by lying down and measuring your height. If you are shorter than usual, the ship is moving.
C) You can determine if the ship is moving by checking your precision time piece. If it's running slow, the ship is moving.
D) You should give up because you have taken on an impossible task!